A Florida man described by prosecutors as one of the most violent rioters who attacked the U.S. Capitol was sentenced on Wednesday to five years in prison, court records show.

Kenneth Bonawitz, a member of the far-right Proud Boys extremist group’s Miami chapter, assaulted at least six police officers as he stormed the Capitol with a mob of Donald Trump supporters on Jan. 6, 2021. He grabbed one of the officers in a chokehold and injured another so severely that the officer had to retire, according to federal prosecutors.

Bonawitz, 58, of Pompano Beach, Florida, carried an eight-inch knife in a sheath on his hip. Police seized the knife from him in between his barrage of attacks on officers.