The far left ecosystem doesn't work in anything like the same way, and doesn't get the push from youtube, but if you want a boogeyman we can agree on the actual Trotskyite SWP (Socialist Workers Party) have a habit of ruining any left-wing movement they get allowed into. Plus, like a lot of close knit social groups, companies and institutions, a sexual assault scandal ("Comrade Delta").

You won't see them recommended on Youtube. I think there are a few "tankies" out there though who also annoy the mainstream left. Named after people who supported the Soviet tanks suppressing revolt in Hungary.

Israel/Palestine politics has a big risk of going from getting outraged about things that actually happened to things that didn't, plus conflating the faults of the government and military of Israel with blame on all Jewish people (which is antisemitic).