To expand a bit on this: just like the main 3 leftist Instances I mentioned before (Lemmy.ml, Lemmygrad.ml and Hexbear.net), there are also many different Instances here on Lemmy (such as lemmy.today and lemmy.world).
However, none of those other Instances are openly Marxist/Leftist. In some cases, some of the users from those other Instances can be openly hostile to leftist users because...they're deeply unserious libs or reactionaries in general lol.
But fear not! First of all, because the mods are here precisely to make sure those unserious users don't cause drama in our community. But also, because a few of those leftist Instances (Lemmygrad.ml and Hexbear.net to be specific) have defederated from those more reactionary Instances.
Defederation is simply the process by which a specific (and reactionary) Instance is no longer allowed to interact with/share content with other leftist instances across Lemmy.
Your help and past efforts are extremely appreciated and helpful right now, thank you!
In the following days I will make sure to add and link everything you've backed up in a way that makes it easy to find