I have heard it stated that the left are the new Nazis, and Michael Moore is setting out to prove it.
They also have committed horrible attrocities (some state mandated).
The left is more akin to communist dictators who also use propaganda to brainwash the masses.
Some of the "new left" are anarchist-socialists. These black shirts riot at "peace" rallies and support the killing of US troops. Not a whole lot of difference between the tactics of brown shirts and black shirts (maybe it is more "who you are working for"). Some agitators think that they move of their own accord but actually they are under the thumb of a larger organization. With the "anti(American)War" rallies (which conveniently were pro-Palestinian war), they were organized by global communists. Not everyone who attened those rallies was a communist, some were merely red dupes and useful idiots for the cause of socialism.