Most left wing violence and “radicalism” is in Europe. We don’t really have a radical left in the US. That is just kind of the way things turned out – the McCarthy era was effective in that respect, IMO. As much as the right tries to create one.
Still, the issue of race is usually associated, for historical reasons, with “right wing” and that is all I was pointing out. Fringe, yes, but right-wing nonetheless