But are they leftist?
I mean fascists and neo nazis define an ideology and go look for someone to beat up or murder for it but these leftist groups seem to fail to define any leftist ideology other than "them other guys bad" (well some of the right wing groups have little more than that but their "them other guys" would often be foreigners rather than the opponent political group) so are they.. truly.. leftist?
Some of antifa are obviously leftist, they are the same anarchistic pseudo communists that used to throw rocks at cops and smash macdon.. no wait that also failed to have ideology enough to be worth a side. (unless "Hulk Smash" is an ideology of course)