So, the creators of Lemmy itself (and it's "home" instance lemmy.ml) are Marxist/Leninists (otherwise known as "tankies").

However, they have been smart enough to contain the most virulent tankie bullshit over in LemmyGrad.ml, which most big instances have specifically disconnected themselves from.

They also seem to be pretty hands-off in terms of censorship/banning/belittling "libs" on lemmy.ml and have kept it pretty open. For instance, I created a LeftistInfighting community and have been allowed to express anarchist views there. (I created it because I was immediately banned from LemmyGrad, which had its own LeftistInfighting community that I had the audacity to engage in and link to wikipedia in a comment)