"I know enough about history to know what happened in Europe in the '30s," Judge Mark Dwyer said.
Facebook and Instagram’s decision follows Twitter, which permanently banned him in March 2018.
He was wearing a "Roger Stone Did Nothing Wrong" T-shirt.
Facebook has started removing pages linked to the Proud Boys, the fascist street gang tied to numerous instances of political violence in recent months.
That brings the total number of arrests to five.
This weekend in New York, the Proud Boys were filmed pummeling one man and calling him a “faggot,” and bragging about kicking another “foreigner” in the head.
In Sacramento recently they threatened to destroy anyone who opposed them, even an eight-year-old boy (a lawsuit is pending).