The NeoNazis inthe US have even less contact with actual Nazis, but they are still noxious. Same is true of the antifas.

No, there was never a time in Germany "when all ideologies other than communism were fascist", but there was indeed a time when the communists called anyone who didn't agree to any crazy diktat coming from Moscow "fascist". This of course pushed anyone who wasn't Communist into the arms of the Nazis, with predictable results. The antifas are trying the same trick here. They too will be crushed.