Hey! Hey! Ho! Ho! These Chanting Fascists Got To Go!

Some want to classify Antifa as a terrorist organization. Others are calling for them to be named as a gang. I have yet to see sufficient evidence for either of these. Antifa seems to me more like a mob of feral children in desperate need of some adult supervision. However, this presentation did persuade me that maybe they are simply playing out a scene from a Monty Python movie. Can you guess which one?