The mods of a certain pair of tankie instances a few months ago were talking about taking over all other instances of Lemmy while the userbases became increasingly hostile towards users who disagreed with the idea that Stalin/Lenin did nothing wrong and that China is a perfect country who can do no wrong and has never done anything bad.
People have the right to not be harassed and take action to prevent said harassment.
As of a few months ago, lemmygrad is run by them as well. I don't remember the specifics, but there was talk of some form of taking over every other Lemmy instance as well (I know there were calls for it from at least one of the tankie communities, either lemmygrad or hexbear), and the general hostility of both lemmygrad and hexbear users was why many instances defederated from them at that time.