Not that simple...a local Seattle news reporter who had been reporting on the May day demonstrations since 2012 or so says it's an unholy mix of antifa, anarchists, and black bloc groups(black in this instance refers to clothing not race). Antifa & anarchists have anti-capitalism in common.
I covered ANTIFA as a TV reporter, here's what news often leaves out
They aren’t anarchists.. they are flat out TERRORISTS.