Sorry for the slow reply, apparently I don’t get notifications of messages through the app I’m currently using.
The left wing group of note is Lemmygrad. It was de-federated from lemmy.world before I joined, apparently by mutual agreement. It’s basically a communist haven. Server updates have made it appear for a while, and them seem a lot more friendly than the far right equivalent groups.
I look at them akin to nudists. They have every right to their own space. At the same time, they happily understand that it’s socially inappropriate to hold their meetings outside the local school.