diff --git a/Makefile b/Makefile
index 646c7f91d..ff17c9fca 100644
--- a/Makefile
+++ b/Makefile
@@ -9,8 +9,10 @@ run-dev: | build-dev
 stop-dev:
 	docker-compose -f docker/docker-compose.dev.yml down
 
-get-server-shell:
-	docker-compose -f docker/docker-compose.dev.yml run server bash
+server-shell:
+	docker-compose -f docker/docker-compose.dev.yml run --entrypoint="" server docker/wait-for-dev-dependencies.sh
+	UID=$$(id -u $${USER}) GID=$$(id -g $${USER}) docker-compose -f docker/docker-compose.dev.yml run --entrypoint="" server bash
+	docker-compose -f docker/docker-compose.dev.yml down
 
 reload-proxy:
 	docker-compose -f docker/docker-compose.dev.yml exec -w /etc/caddy proxy caddy reload
diff --git a/autoupdate b/autoupdate
index 0197c762d..76d3f5385 160000
--- a/autoupdate
+++ b/autoupdate
@@ -1 +1 @@
-Subproject commit 0197c762d94c0723b377b0b2773fb329b7ccaeca
+Subproject commit 76d3f5385e0a76e79d09d573041a0839d8f483d0
diff --git a/client/src/app/core/repositories/chat/chat-group-repository.service.ts b/client/src/app/core/repositories/chat/chat-group-repository.service.ts
index 245bb0ec9..a439707aa 100644
--- a/client/src/app/core/repositories/chat/chat-group-repository.service.ts
+++ b/client/src/app/core/repositories/chat/chat-group-repository.service.ts
@@ -18,8 +18,14 @@ import { DataStoreService } from '../../core-services/data-store.service';
 const ChatGroupRelations: RelationDefinition[] = [
     {
         type: 'M2M',
-        ownIdKey: 'access_groups_id',
-        ownKey: 'access_groups',
+        ownIdKey: 'read_groups_id',
+        ownKey: 'read_groups',
+        foreignViewModel: ViewGroup
+    },
+    {
+        type: 'M2M',
+        ownIdKey: 'write_groups_id',
+        ownKey: 'write_groups',
         foreignViewModel: ViewGroup
     }
 ];
diff --git a/client/src/app/shared/animations.ts b/client/src/app/shared/animations.ts
index 2e14acd1e..72f2747a1 100644
--- a/client/src/app/shared/animations.ts
+++ b/client/src/app/shared/animations.ts
@@ -1,5 +1,10 @@
 import { animate, state, style, transition, trigger } from '@angular/animations';
 
+const fadeSpeed = {
+    fast: 200,
+    slow: 600
+};
+
 const slideIn = [style({ transform: 'translateX(-85%)' }), animate('600ms ease')];
 const slideOut = [
     style({ transform: 'translateX(0)' }),
@@ -11,9 +16,15 @@ const slideOut = [
     )
 ];
 
+export const collapseAndFade = trigger('collapse', [
+    state('in', style({ opacity: 1, height: '100%' })),
+    transition(':enter', [style({ opacity: 0, height: 0 }), animate(fadeSpeed.fast)]),
+    transition(':leave', animate(fadeSpeed.fast, style({ opacity: 0, height: 0 })))
+]);
+
 export const fadeAnimation = trigger('fade', [
     state('in', style({ opacity: 1 })),
-    transition(':enter', [style({ opacity: 0 }), animate(600)]),
-    transition(':leave', animate(600, style({ opacity: 0 })))
+    transition(':enter', [style({ opacity: 0 }), animate(fadeSpeed.slow)]),
+    transition(':leave', animate(fadeSpeed.slow, style({ opacity: 0 })))
 ]);
 export const navItemAnim = trigger('navItemAnim', [transition(':enter', slideIn), transition(':leave', slideOut)]);
diff --git a/client/src/app/shared/components/icon-container/icon-container.component.scss b/client/src/app/shared/components/icon-container/icon-container.component.scss
index 341d973f5..c8ccb2794 100644
--- a/client/src/app/shared/components/icon-container/icon-container.component.scss
+++ b/client/src/app/shared/components/icon-container/icon-container.component.scss
@@ -18,10 +18,6 @@ os-icon-container {
     display: flex;
     align-items: center;
 
-    & + & {
-        margin-top: 5px;
-    }
-
     &.small-container {
         @include icon-container(12px, 12px, 400);
     }
diff --git a/client/src/app/shared/models/chat/chat-group.ts b/client/src/app/shared/models/chat/chat-group.ts
index 78d47e751..1de4d1def 100644
--- a/client/src/app/shared/models/chat/chat-group.ts
+++ b/client/src/app/shared/models/chat/chat-group.ts
@@ -5,7 +5,8 @@ export class ChatGroup extends BaseModel<ChatGroup> {
 
     public id: number;
     public name: string;
-    public access_groups_id: number[];
+    public read_groups_id: number[];
+    public write_groups_id: number[];
 
     public constructor(input?: any) {
         super(ChatGroup.COLLECTIONSTRING, input);
diff --git a/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.html b/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.html
index eb65cc9e1..7b8fc17ff 100644
--- a/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.html
+++ b/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.html
@@ -1,17 +1,29 @@
 <div class="chat-header" *osPerms="permission.chatCanManage">
     <os-icon-container
         icon="group"
-        *ngIf="chatGroup.access_groups.length"
-        matTooltip="{{ 'Access groups' | translate }}"
+        *ngIf="chatGroup.write_groups.length"
+        matTooltip="{{ 'Groups with write permissions' | translate }}"
     >
-        <span *ngFor="let group of chatGroup.access_groups | slice: 0:3; let last = last">
+        <span *ngFor="let group of chatGroup.write_groups | slice: 0:3; let last = last">
             <span>{{ group.getTitle() | translate }}</span>
             <span *ngIf="!last">, </span>
-            <span *ngIf="last && chatGroup.access_groups.length > 3">...</span>
+            <span *ngIf="last && chatGroup.write_groups.length > 3">...</span>
+        </span>
+    </os-icon-container>
+
+    <os-icon-container
+        icon="remove_red_eye"
+        *ngIf="readOnlyGroups.length"
+        matTooltip="{{ 'Groups with read permissions' | translate }}"
+    >
+        <span *ngFor="let group of readOnlyGroups | slice: 0:3; let last = last">
+            <span>{{ group.getTitle() | translate }}</span>
+            <span *ngIf="!last">, </span>
+            <span *ngIf="last && chatGroup.read_groups.length > 3">...</span>
         </span>
     </os-icon-container>
     <button class="chat-options" mat-icon-button [matMenuTriggerFor]="chatgroupMenu">
-        <mat-icon> more_vert </mat-icon>
+        <mat-icon>more_vert</mat-icon>
     </button>
 </div>
 
@@ -41,5 +53,4 @@
             <span>{{ 'Delete' | translate }}</span>
         </button>
     </ng-container>
-    <!-- edit -->
 </mat-menu>
diff --git a/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.ts b/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.ts
index 60497cb88..343fc1f10 100644
--- a/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.ts
+++ b/client/src/app/site/chat/components/chat-group-detail/chat-group-detail.component.ts
@@ -22,6 +22,7 @@ import { ChatGroup } from 'app/shared/models/chat/chat-group';
 import { infoDialogSettings } from 'app/shared/utils/dialog-settings';
 import { BaseViewComponentDirective } from 'app/site/base/base-view';
 import { ChatNotificationService } from 'app/site/chat/services/chat-notification.service';
+import { ViewGroup } from 'app/site/users/models/view-group';
 import {
     ChatGroupData,
     EditChatGroupDialogComponent
@@ -51,6 +52,12 @@ export class ChatGroupDetailComponent extends BaseViewComponentDirective impleme
         return isOnBottom;
     }
 
+    public get readOnlyGroups(): ViewGroup[] {
+        const readGroups = this.chatGroup?.read_groups;
+        const writeGrous = this.chatGroup?.write_groups;
+        return readGroups?.filter(group => !writeGrous.includes(group)) || [];
+    }
+
     public constructor(
         titleService: Title,
         protected translate: TranslateService,
@@ -111,7 +118,8 @@ export class ChatGroupDetailComponent extends BaseViewComponentDirective impleme
     public editChat(): void {
         const chatData: ChatGroupData = {
             name: this.chatGroup.name,
-            access_groups_id: this.chatGroup.access_groups_id
+            read_groups_id: this.chatGroup.read_groups_id,
+            write_groups_id: this.chatGroup.write_groups_id
         };
 
         const dialogRef = this.dialog.open(EditChatGroupDialogComponent, {
diff --git a/client/src/app/site/chat/components/chat-message/chat-message.component.html b/client/src/app/site/chat/components/chat-message/chat-message.component.html
index cf0bcdca6..9d7d5349e 100644
--- a/client/src/app/site/chat/components/chat-message/chat-message.component.html
+++ b/client/src/app/site/chat/components/chat-message/chat-message.component.html
@@ -4,8 +4,12 @@
     </div>
     <div
         class="chat-text"
-        [ngClass]="{ 'background-primary': !isOwnMessage, 'background-primary-darkest': isOwnMessage }"
-        [matMenuTriggerFor]="canDelete ? singleChatMenu : null"
+        [ngClass]="{
+            disabled: !canDelete,
+            'background-primary': !isOwnMessage,
+            'background-primary-darkest': isOwnMessage
+        }"
+        [matMenuTriggerFor]="singleChatMenu"
     >
         {{ text }}
         <div class="timestamp">{{ date | localizedDate }}</div>
diff --git a/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.html b/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.html
index 44db6b585..342269cfd 100644
--- a/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.html
+++ b/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.html
@@ -1,9 +1,9 @@
-<mat-tab-group (selectedTabChange)="selectedTabChange($event)" *ngIf="chatGroupsExist()">
+<mat-tab-group (selectedTabChange)="selectedTabChange($event)" *ngIf="chatGroupsExist">
     <mat-tab *ngFor="let chat of chatGroupSubject | async">
         <ng-template mat-tab-label>
             <span
-                [matBadgeHidden]="!getNotidficationsForChatId(chat.id)"
-                [matBadge]="getNotidficationsForChatId(chat.id)"
+                [matBadgeHidden]="!getNotificationsForChatId(chat.id)"
+                [matBadge]="getNotificationsForChatId(chat.id)"
                 matBadgeColor="accent"
                 matBadgeOverlap="false"
             >
@@ -16,14 +16,14 @@
     </mat-tab>
 </mat-tab-group>
 
-<div *ngIf="!chatGroupsExist()">
+<div *ngIf="!chatGroupsExist">
     <span>
         {{ 'No chat groups available' | translate }}
     </span>
 </div>
 
 <!-- send chat -->
-<form [formGroup]="newMessageForm" (ngSubmit)="send()" *ngIf="chatGroupsExist()">
+<form [formGroup]="newMessageForm" (ngSubmit)="send()" *ngIf="chatGroupsExist && canSendInSelectedChat" [@collapse]>
     <mat-form-field appearance="outline" class="chat-form-field">
         <input class="chat-input" type="text" matInput formControlName="text" />
         <mat-label>{{ 'Message' | translate }}</mat-label>
diff --git a/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.ts b/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.ts
index e634144c5..f18c5eaa2 100644
--- a/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.ts
+++ b/client/src/app/site/chat/components/chat-tabs/chat-tabs.component.ts
@@ -7,8 +7,10 @@ import { Title } from '@angular/platform-browser';
 import { TranslateService } from '@ngx-translate/core';
 import { BehaviorSubject, Observable } from 'rxjs';
 
+import { OperatorService } from 'app/core/core-services/operator.service';
 import { ChatGroupRepositoryService } from 'app/core/repositories/chat/chat-group-repository.service';
 import { ChatMessageRepositoryService } from 'app/core/repositories/chat/chat-message-repository.service';
+import { collapseAndFade } from 'app/shared/animations';
 import { ChatMessage } from 'app/shared/models/chat/chat-message';
 import { BaseViewComponentDirective } from 'app/site/base/base-view';
 import { ChatNotificationService, NotificationAmount } from '../../services/chat-notification.service';
@@ -18,7 +20,8 @@ import { ViewChatGroup } from '../../models/view-chat-group';
     selector: 'os-chat-tabs',
     templateUrl: './chat-tabs.component.html',
     styleUrls: ['./chat-tabs.component.scss'],
-    encapsulation: ViewEncapsulation.None
+    encapsulation: ViewEncapsulation.None,
+    animations: [collapseAndFade]
 })
 export class ChatTabsComponent extends BaseViewComponentDirective implements OnInit {
     public chatGroupSubject: BehaviorSubject<ViewChatGroup[]>;
@@ -27,6 +30,21 @@ export class ChatTabsComponent extends BaseViewComponentDirective implements OnI
 
     private notifications: NotificationAmount;
 
+    private get chatGroupFromIndex(): ViewChatGroup {
+        return this.chatGroupSubject.value[this.selectedTabIndex];
+    }
+
+    public get chatGroupsExist(): boolean {
+        return this.chatGroupSubject.value.length > 0;
+    }
+
+    public get canSendInSelectedChat(): boolean {
+        if (!this.chatGroupFromIndex) {
+            return false;
+        }
+        return this.operator.isInGroupIds(...this.chatGroupFromIndex?.write_groups_id) || false;
+    }
+
     public constructor(
         titleService: Title,
         translate: TranslateService,
@@ -34,6 +52,7 @@ export class ChatTabsComponent extends BaseViewComponentDirective implements OnI
         private repo: ChatGroupRepositoryService,
         private chatMessageRepo: ChatMessageRepositoryService,
         private chatNotificationService: ChatNotificationService,
+        private operator: OperatorService,
         formBuilder: FormBuilder
     ) {
         super(titleService, translate, matSnackBar);
@@ -55,14 +74,10 @@ export class ChatTabsComponent extends BaseViewComponentDirective implements OnI
         this.selectedTabIndex = event.index;
     }
 
-    public getNotidficationsForChatId(chatId: number): number {
+    public getNotificationsForChatId(chatId: number): number {
         return this.notifications?.[chatId] ?? 0;
     }
 
-    public chatGroupsExist(): boolean {
-        return this.chatGroupSubject.value.length > 0;
-    }
-
     public isChatMessageEmpty(): boolean {
         return !this.newMessageForm?.value?.text?.trim();
     }
@@ -70,7 +85,7 @@ export class ChatTabsComponent extends BaseViewComponentDirective implements OnI
     public send(): void {
         const payload = {
             text: this.newMessageForm.value.text,
-            chatgroup_id: this.chatGroupSubject.value[this.selectedTabIndex].id
+            chatgroup_id: this.chatGroupFromIndex.id
         };
         this.chatMessageRepo
             .create(payload as ChatMessage)
diff --git a/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.html b/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.html
index 9320b025e..7519d1753 100644
--- a/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.html
+++ b/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.html
@@ -24,9 +24,17 @@
         <!-- Groups -->
         <mat-form-field>
             <os-search-value-selector
-                formControlName="access_groups_id"
+                formControlName="read_groups_id"
                 [multiple]="true"
-                placeholder="{{ 'Access groups' | translate }}"
+                placeholder="{{ 'Groups with read permissions' | translate }}"
+                [inputListValues]="groupsBehaviorSubject"
+            ></os-search-value-selector>
+        </mat-form-field>
+        <mat-form-field>
+            <os-search-value-selector
+                formControlName="write_groups_id"
+                [multiple]="true"
+                placeholder="{{ 'Groups with write permissions' | translate }}"
                 [inputListValues]="groupsBehaviorSubject"
             ></os-search-value-selector>
         </mat-form-field>
diff --git a/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.ts b/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.ts
index 8f505d037..ca7bb0885 100644
--- a/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.ts
+++ b/client/src/app/site/chat/components/edit-chat-group-dialog/edit-chat-group-dialog.component.ts
@@ -10,7 +10,8 @@ import { ViewGroup } from 'app/site/users/models/view-group';
 
 export interface ChatGroupData {
     name: string;
-    access_groups_id: number[];
+    read_groups_id: number[];
+    write_groups_id: number[];
 }
 
 @Component({
@@ -36,7 +37,8 @@ export class EditChatGroupDialogComponent {
         this.createMode = !data;
         this.createUpdateForm = formBuilder.group({
             name: [data?.name || '', Validators.required],
-            access_groups_id: [data?.access_groups_id || []]
+            read_groups_id: [data?.read_groups_id || []],
+            write_groups_id: [data?.write_groups_id || []]
         });
         this.groupsBehaviorSubject = groupRepo.getViewModelListBehaviorSubject();
     }
diff --git a/client/src/app/site/chat/models/view-chat-group.ts b/client/src/app/site/chat/models/view-chat-group.ts
index 23a2c19b3..c1dcab5dd 100644
--- a/client/src/app/site/chat/models/view-chat-group.ts
+++ b/client/src/app/site/chat/models/view-chat-group.ts
@@ -15,5 +15,6 @@ export class ViewChatGroup extends BaseViewModel<ChatGroup> implements ChatGroup
     }
 }
 export interface ViewChatGroup extends ChatGroup {
-    access_groups: ViewGroup[];
+    read_groups: ViewGroup[];
+    write_groups: ViewGroup[];
 }
diff --git a/client/src/app/site/chat/services/chat.service.ts b/client/src/app/site/chat/services/chat.service.ts
index e6c31f444..a7b85f48b 100644
--- a/client/src/app/site/chat/services/chat.service.ts
+++ b/client/src/app/site/chat/services/chat.service.ts
@@ -18,9 +18,9 @@ export class ChatService {
     private canSeeSomeChatGroup = false;
     private canManage = false;
 
-    private canSeeChat = new BehaviorSubject<boolean>(false);
+    private canSeeChatSubject = new BehaviorSubject<boolean>(false);
     public get canSeeChatObservable(): Observable<boolean> {
-        return this.canSeeChat.asObservable();
+        return this.canSeeChatSubject.asObservable();
     }
 
     public constructor(
@@ -34,7 +34,7 @@ export class ChatService {
         });
 
         this.repo.getViewModelListBehaviorSubject().subscribe(groups => {
-            this.canSeeSomeChatGroup = !!groups && groups.length > 0;
+            this.canSeeSomeChatGroup = groups?.length > 0;
             this.update();
         });
 
@@ -45,6 +45,6 @@ export class ChatService {
     }
 
     private update(): void {
-        this.canSeeChat.next(this.chatEnabled && (this.canSeeSomeChatGroup || this.canManage));
+        this.canSeeChatSubject.next(this.chatEnabled && (this.canSeeSomeChatGroup || this.canManage));
     }
 }
diff --git a/docker/docker-compose.dev.yml b/docker/docker-compose.dev.yml
index 9d680394e..8aea37414 100644
--- a/docker/docker-compose.dev.yml
+++ b/docker/docker-compose.dev.yml
@@ -18,6 +18,7 @@ services:
       - ../server:/app
     depends_on:
       - redis
+      - postgres
 
   postgres:
     image: postgres:11
diff --git a/server/docker/entrypoint-dev b/server/docker/entrypoint-dev
index fb44f22f0..d5ae75895 100755
--- a/server/docker/entrypoint-dev
+++ b/server/docker/entrypoint-dev
@@ -19,12 +19,7 @@ function isSettingsFileOk() {
     return 0;
 }
 
-wait-for-it -t 0 redis:6379
-
-until pg_isready -h postgres -p 5432 -U openslides; do
-    echo "Waiting for Postgres to become available..."
-    sleep 3
-done
+/app/docker/wait-for-dev-dependencies.sh
 
 if [[ ! -f "/app/personal_data/var/settings.py" ]]; then
     echo "Create settings"
diff --git a/server/docker/wait-for-dev-dependencies.sh b/server/docker/wait-for-dev-dependencies.sh
new file mode 100755
index 000000000..dbb092d71
--- /dev/null
+++ b/server/docker/wait-for-dev-dependencies.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+wait-for-it -t 0 redis:6379
+
+until pg_isready -h postgres -p 5432 -U openslides; do
+    echo "Waiting for Postgres to become available..."
+    sleep 3
+done
diff --git a/server/manage.py b/server/manage.py
old mode 100755
new mode 100644
diff --git a/server/openslides/chat/access_permissions.py b/server/openslides/chat/access_permissions.py
index 8a7b9b466..71aff3eb1 100644
--- a/server/openslides/chat/access_permissions.py
+++ b/server/openslides/chat/access_permissions.py
@@ -7,7 +7,7 @@ from openslides.utils.auth import async_has_perm, async_in_some_groups
 class ChatGroupAccessPermissions(BaseAccessPermissions):
     """
     Access permissions container for ChatGroup and ChatGroupViewSet.
-    No base perm: The access permissions are done with the access groups
+    No base perm: The access permissions are done with the read/write groups.
     """
 
     async def get_restricted_data(
@@ -22,10 +22,11 @@ class ChatGroupAccessPermissions(BaseAccessPermissions):
             data = full_data
         else:
             for full in full_data:
-                access_groups = full.get("access_groups_id", [])
-                if len(
-                    full.get("access_groups_id", [])
-                ) == 0 or await async_in_some_groups(user_id, access_groups):
+                read_groups = full.get("read_groups_id", [])
+                write_groups = full.get("write_groups_id", [])
+                if await async_in_some_groups(
+                    user_id, read_groups
+                ) or await async_in_some_groups(user_id, write_groups):
                     data.append(full)
         return data
 
diff --git a/server/openslides/chat/migrations/0002_new_access_groups_1.py b/server/openslides/chat/migrations/0002_new_access_groups_1.py
new file mode 100644
index 000000000..4f3af471b
--- /dev/null
+++ b/server/openslides/chat/migrations/0002_new_access_groups_1.py
@@ -0,0 +1,33 @@
+# Generated by Finn Stutzenstein on 2021-02-18 08:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat", "0001_initial"),
+        ("users", "0016_remove_user_ordering"),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name="chatgroup",
+            old_name="access_groups",
+            new_name="read_groups",
+        ),
+        migrations.AlterField(
+            model_name="chatgroup",
+            name="read_groups",
+            field=models.ManyToManyField(
+                blank=True, related_name="chat_read_groups", to="users.Group"
+            ),
+        ),
+        migrations.AddField(
+            model_name="chatgroup",
+            name="write_groups",
+            field=models.ManyToManyField(
+                blank=True, related_name="chat_write_groups", to="users.Group"
+            ),
+        ),
+    ]
diff --git a/server/openslides/chat/migrations/0003_new_access_groups_2.py b/server/openslides/chat/migrations/0003_new_access_groups_2.py
new file mode 100644
index 000000000..c7dfbdee4
--- /dev/null
+++ b/server/openslides/chat/migrations/0003_new_access_groups_2.py
@@ -0,0 +1,19 @@
+# Generated by Finn Stutzenstein on 2021-02-18 08:12
+
+from django.db import migrations
+
+
+def copy_read_groups_to_write_groups(apps, schema_editor):
+    ChatGroup = apps.get_model("chat", "ChatGroup")
+
+    for chatgroup in ChatGroup.objects.all():
+        chatgroup.write_groups.add(*chatgroup.read_groups.all())
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat", "0002_new_access_groups_1"),
+    ]
+
+    operations = [migrations.RunPython(copy_read_groups_to_write_groups)]
diff --git a/server/openslides/chat/models.py b/server/openslides/chat/models.py
index d3d1be93d..184fa9edf 100644
--- a/server/openslides/chat/models.py
+++ b/server/openslides/chat/models.py
@@ -18,7 +18,7 @@ class ChatGroupManager(BaseManager):
         return (
             super()
             .get_prefetched_queryset(*args, **kwargs)
-            .prefetch_related("access_groups")
+            .prefetch_related("read_groups", "write_groups")
         )
 
 
@@ -30,8 +30,11 @@ class ChatGroup(RESTModelMixin, models.Model):
     objects = ChatGroupManager()
 
     name = models.CharField(max_length=256)
-    access_groups = models.ManyToManyField(
-        settings.AUTH_GROUP_MODEL, blank=True, related_name="chat_access_groups"
+    read_groups = models.ManyToManyField(
+        settings.AUTH_GROUP_MODEL, blank=True, related_name="chat_read_groups"
+    )
+    write_groups = models.ManyToManyField(
+        settings.AUTH_GROUP_MODEL, blank=True, related_name="chat_write_groups"
     )
 
     class Meta:
@@ -41,14 +44,11 @@ class ChatGroup(RESTModelMixin, models.Model):
     def __str__(self):
         return self.name
 
-    def can_access(self, user):
+    def can_write(self, user):
         if has_perm(user.id, "chat.can_manage"):
             return True
 
-        if not self.access_groups.exists():
-            return True
-
-        return in_some_groups(user.id, self.access_groups.values_list(flat=True))
+        return in_some_groups(user.id, self.write_groups.values_list(flat=True))
 
 
 class ChatMessageManager(BaseManager):
@@ -61,7 +61,9 @@ class ChatMessageManager(BaseManager):
         return (
             super()
             .get_prefetched_queryset(*args, **kwargs)
-            .prefetch_related("chatgroup", "chatgroup__access_groups")
+            .prefetch_related(
+                "chatgroup", "chatgroup__read_groups", "chatgroup__write_groups"
+            )
         )
 
 
diff --git a/server/openslides/chat/serializers.py b/server/openslides/chat/serializers.py
index 6dd563bdf..deae6650b 100644
--- a/server/openslides/chat/serializers.py
+++ b/server/openslides/chat/serializers.py
@@ -14,7 +14,10 @@ class ChatGroupSerializer(ModelSerializer):
     Serializer for chat.models.ChatGroup objects.
     """
 
-    access_groups = IdPrimaryKeyRelatedField(
+    read_groups = IdPrimaryKeyRelatedField(
+        many=True, required=False, queryset=get_group_model().objects.all()
+    )
+    write_groups = IdPrimaryKeyRelatedField(
         many=True, required=False, queryset=get_group_model().objects.all()
     )
 
@@ -23,7 +26,8 @@ class ChatGroupSerializer(ModelSerializer):
         fields = (
             "id",
             "name",
-            "access_groups",
+            "read_groups",
+            "write_groups",
         )
 
 
@@ -35,7 +39,8 @@ class ChatMessageSerializer(ModelSerializer):
     chatgroup = IdPrimaryKeyRelatedField(
         required=False, queryset=ChatGroup.objects.all()
     )
-    access_groups_id = SerializerMethodField()
+    read_groups_id = SerializerMethodField()
+    write_groups_id = SerializerMethodField()
 
     class Meta:
         model = ChatMessage
@@ -46,7 +51,8 @@ class ChatMessageSerializer(ModelSerializer):
             "timestamp",
             "username",
             "user_id",
-            "access_groups_id",
+            "read_groups_id",
+            "write_groups_id",
         )
         read_only_fields = (
             "username",
@@ -58,5 +64,8 @@ class ChatMessageSerializer(ModelSerializer):
             data["text"] = validate_html_strict(data["text"])
         return data
 
-    def get_access_groups_id(self, chatmessage):
-        return [group.id for group in chatmessage.chatgroup.access_groups.all()]
+    def get_read_groups_id(self, chatmessage):
+        return [group.id for group in chatmessage.chatgroup.read_groups.all()]
+
+    def get_write_groups_id(self, chatmessage):
+        return [group.id for group in chatmessage.chatgroup.write_groups.all()]
diff --git a/server/openslides/chat/views.py b/server/openslides/chat/views.py
index 96eac207c..d97406a05 100644
--- a/server/openslides/chat/views.py
+++ b/server/openslides/chat/views.py
@@ -51,8 +51,8 @@ class ChatGroupViewSet(ModelViewSet):
 
     def update(self, *args, **kwargs):
         response = super().update(*args, **kwargs)
-        # Update all affected chatmessages to update their `access_groups_id` field,
-        # which is taken from the updated chatgroup.
+        # Update all affected chatmessages to update their `read_groups_id`  and
+        # `write_groups_id` field, which is taken from the updated chatgroup.
         inform_changed_data(ChatMessage.objects.filter(chatgroup=self.get_object()))
         return response
 
@@ -93,7 +93,7 @@ class ChatMessageViewSet(
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
 
-        if not serializer.validated_data["chatgroup"].can_access(self.request.user):
+        if not serializer.validated_data["chatgroup"].can_write(self.request.user):
             self.permission_denied(self.request)
 
         # Do not use the serializer.save since it will put the model in the history.
diff --git a/server/openslides/users/views.py b/server/openslides/users/views.py
index 77c3688d7..e403cb301 100644
--- a/server/openslides/users/views.py
+++ b/server/openslides/users/views.py
@@ -22,6 +22,7 @@ from django.http.request import QueryDict
 from django.utils.encoding import force_bytes, force_text
 from django.utils.http import urlsafe_base64_decode, urlsafe_base64_encode
 
+from openslides.chat.models import ChatGroup
 from openslides.saml import SAML_ENABLED
 from openslides.utils import logging
 
@@ -229,6 +230,7 @@ class UserViewSet(ModelViewSet):
                 old_delegation_user.save()
 
         inform_changed_data(user)
+        inform_changed_data(ChatGroup.objects.all())
         return response
 
     def assert_vote_not_delegated(self, user):
diff --git a/server/tests/integration/chat/test_chat.py b/server/tests/integration/chat/test_chat.py
index a2ad6cf52..4d450b90c 100644
--- a/server/tests/integration/chat/test_chat.py
+++ b/server/tests/integration/chat/test_chat.py
@@ -10,19 +10,24 @@ def test_motion_db_queries():
     """
     Tests that only the following db queries for chat groups are done:
     * 1 request to get all chat groups
-    * 1 request to get all access groups
+    * 1 request to get all read groups
+    * 1 request to get all write groups
 
     Tests that only the following db queries for chat messages are done:
     * 1 request to fet all chat messages
     * 1 request to get all chat groups
-    * 1 request to get all access groups
+    * 1 request to get all read groups
+    * 1 request to get all write groups
     """
     group1 = get_group_model().objects.create(name="group1")
     group2 = get_group_model().objects.create(name="group2")
+    group3 = get_group_model().objects.create(name="group3")
+    group4 = get_group_model().objects.create(name="group4")
 
     for i1 in range(5):
         chatgroup = ChatGroup.objects.create(name=f"motion{i1}")
-        chatgroup.access_groups.add(group1, group2)
+        chatgroup.read_groups.add(group1, group2)
+        chatgroup.write_groups.add(group3, group4)
 
         for i2 in range(10):
             ChatMessage.objects.create(
@@ -32,5 +37,5 @@ def test_motion_db_queries():
                 chatgroup=chatgroup,
             )
 
-    assert count_queries(ChatGroup.get_elements)() == 2
-    assert count_queries(ChatMessage.get_elements)() == 3
+    assert count_queries(ChatGroup.get_elements)() == 3
+    assert count_queries(ChatMessage.get_elements)() == 4