State-run communism as it has actually existed and fascism end up with very similar results, not the least because both believed in fast progress, dismantling traditional communities and value systems and everything being run by a strong man with an iron fist. The fascist dictator is supposedly a personification of the will of the “people” or “nation”, while the communist one is the same for the “proletariat” or, indeed, the “people”. The fact that both systems produce cleptocratic oligarchies that destroy lives of ordinary people is no accident.

This is also why the “extreme left” supposed by the OP is not extreme at all. Some just tend to confuse evend mild and moderate social democracy with genocidal communism, perhaps because their domestic political landscape is fucked up beyond recognition