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Slack organizes conversations into dedicated spaces called channels. When someone no longer needs to be a part of a channel, they can be removed. By default, Workspace Owners and Admins can remove people from public channels, and members can remove people from private channels.
What to expect
Anyone can be removed from a channel by those with permission.
All members and guests need to be added back to a private channel to rejoin it, and guests also need to be added back to a public channel to rejoin it.