In what is becoming a regular feature of American life, left-wing radicals showed up at a right-wing radical event and attacked it. Much like what happened here in Georgia at Stone Mountain not long ago, the counterprotesters greatly outnumbered the protesters.
I don't care for Nazis or Klansmen, so I can't really bring myself to shed many tears over this. On the other hand, we see the same sort of behavior being pointed at Donald Trump rallies -- and he's twice now faced a potential assassin coming after him personally. It seems as if the right to a dissenting opinion is not being undermined only for the Klan and their ilk. Rather, the strategy seems to be to paint a large part of Americans' views as deserving of physical silencing.