Question: Which worldwide one-percenter motorcycle club was Sonny Barger a founding member of in Oakland, California?
Sentence (from "Sonny Barger"): Ralph Hubert "Sonny" Barger (born October 8, 1938) is an American author and actor, who is a founding member (1957) of the Oakland, California, U.S. chapter of the Hells Angels Motorcycle Club.
Relevant evidence: Yes