Just a couple of names. StationMarx, Rabkor, Rudoy (yeh, this cringe Trot). Those are openly leftist and were rather big back when I bothered to check.

StationMarx was actually fine wa-a-a-a-a-a-a-ay back in the day, but then some weird cucks literally took over the whole resource network and now disgrace the whole movement by doing shit similar to that interview r/AntiWork mod did.