diff --git a/web/chat/member-list-sidebar/member-list-sidebar.css b/web/chat/member-list-sidebar/member-list-sidebar.css
new file mode 100644
--- /dev/null
+++ b/web/chat/member-list-sidebar/member-list-sidebar.css
@@ -0,0 +1,8 @@
+.container {
+  padding: 0 8px 16px;
+  overflow-y: scroll;
+}
+
+div.noScroll {
+  overflow: hidden;
+}
diff --git a/web/chat/member-list-sidebar/member-list-sidebar.react.js b/web/chat/member-list-sidebar/member-list-sidebar.react.js
new file mode 100644
--- /dev/null
+++ b/web/chat/member-list-sidebar/member-list-sidebar.react.js
@@ -0,0 +1,52 @@
+// @flow
+
+import classNames from 'classnames';
+import * as React from 'react';
+
+import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
+import { useMembersGroupedByRole } from 'lib/utils/role-utils.js';
+
+import css from './member-list-sidebar.css';
+import RoleGroupMemberList from './role-group-member-list.react.js';
+import { useSelector } from '../../redux/redux-utils.js';
+
+type Props = {
+  +threadID: string,
+};
+
+function MembersListSidebar(props: Props): React.Node {
+  const { threadID } = props;
+
+  const threadInfo = useSelector(state => threadInfoSelector(state)[threadID]);
+
+  const membersGroupedByRole = useMembersGroupedByRole(threadInfo);
+
+  const [openMenu, setOpenMenu] = React.useState<?string>(null);
+
+  const groupedMemberList = React.useMemo(
+    () =>
+      Array.from(membersGroupedByRole).map(([roleName, memberInfos], index) => (
+        <RoleGroupMemberList
+          key={index}
+          roleName={roleName}
+          members={memberInfos}
+          threadInfo={threadInfo}
+          setOpenMenu={setOpenMenu}
+        />
+      )),
+    [membersGroupedByRole, threadInfo],
+  );
+
+  const containerClassName = classNames(css.container, {
+    [css.noScroll]: !!openMenu,
+  });
+
+  const memberListSidebar = React.useMemo(
+    () => <div className={containerClassName}>{groupedMemberList}</div>,
+    [containerClassName, groupedMemberList],
+  );
+
+  return memberListSidebar;
+}
+
+export default MembersListSidebar;