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Youtube videos from a ML (or at least Marxist) perspective?
(lemmygrad.ml)
Talk about whatever, respecting the rules established by Lemmygrad. Failing to comply with the rules will grant you a few warnings, insisting on breaking them will grant you a beautiful shiny banwall.
A community for comrades to chat and talk about whatever doesn't fit other communities
Nobody mentioned Prolekult yet. Sure they focus on economics a lot (like Michael Roberts, but their videos have good production value and are good to share with people who might be new to communism/Marxism.
They made a full length documentary that hasn't gotten many views (I think the length turns people off) but I remember it being decent.
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: