This article has a fishy smell to it. There's one or more infiltrating leftists involved here somewhere in my opinion. There are some people who act like racists connected with the movement to stop illegal immigration. However, I think many of them are leftist agents provacateurs.
I thought that too. Don't put it past the government either - the MM have basically embarrassed them, and they want to retaliate. Some of the worst rioters in the '60s turned out to be agents, who were sent there to de-legitimize the movements by pushing them over the edge.
Nothing would de-legitimize the MM better than by painting them as Klansmen, which both the government and leftist agitators know.