#ActivityPub carries posts, follows, likes and so on, but not moderation. A ban stays trapped on the instance that issued it. So, for instance, an account banned for racism on one instance stays unknown to the next. Moderation is activity too, and it should travel like the rest: signed and verifiable. This is a real problem, and others have explored it already. I will look into what already exists and see what we could build on for #HolosSocial.