Back in the 1950s America faced a threat from communism. Looking back on this era, those of the left will loudly complain about how American communists were denied their civil rights.
Let's fast forward fifty years. I'd like to see the same people on the left who denounce McCarthyism speak up in favor of the rights of neo-Nazis to peacefully march.
The march was allegedly to demonstrate against black gangs. So what do black gangs do? They prove the white supremacists' point by rioting.
Does America face a threat from neo-Nazi white supremacists? Based on the fact that only "two dozen" showed up to the march, I'd have to say that they are a pretty small fringe group. The hundreds of gang members who showed up to riot are a lot scarier.