It might be possible with 3rd party moderation tools. Just using the web interface, you can only do mod actions from a post in your community. Like, I can't ban someone from FoodPorn from a post they made in, say, PoliticalMemes. I don't have any mod options when viewing communities I am not a moderator for on my app (Connect) or the web interface for Lemmy. World or Pawb.Social, but I have seen a few mentions of more robust mod tools in other apps.
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