"those laws apply to individuals or organizations, not concepts or movements or ideas"

Not to put too fine a point on it, but if a person was to throw a bottle of water at a mass of street brawlers dressed in law enforcement surplus black helmets/goggles/boots, one is just as likely to hit a fascist as an anti-fascist.

That was not the case in 1930's Vienna when my relatives patrolled the streets of their community looking to brawl with rampaging Nazi thugs who were harassing Jewish merchants and neighbors. I've walked those streets with my sister, from the apartment to gymnasium, awed by neighborhood buildings that still have bullet pockmarks in the walls.

To my uncle's great disappointment, when they finally accepted him into the US Army, they stationed him in a New York warehouse with hundreds of crates of captured German documents to translate/decode. A good Catholic, what he deeply hoped for was infantry; to be a machine gunner and shoot Nazis.
I believe he was a little envious of my father who ended up in Nuremberg with the US Army medical corps, assuring that Nazis on trial lived long enough to hang.