What is the difference between these chaps and the Black Bloc protesters?
It seems to me that Antifa is kind of like Alt-Right, in that there are numerous groups that claim to be a part of it, some much worse than others. It also seems rather disorganized.
Black Bloc is a tactic from the 80's, antifa is from 20's-30's Europe where fascists started getting into the government and leftists started fighting them. Today black bloc is the preferred tactic of the left and antifa is a catchall term for protesting reactionaries or part of a deep-state conspiracy to attack WoD.