Question: International outlaw motorcycle club, Rock Machine, was formed in what year by a former friend of the worldwide one-percenter motorcycle club whose members typically ride Harley-Davidson motorcycles, Hells Angels?
Sentence (from "Warlocks Motorcycle Club (Pennsylvania)"): The club is most prominent in the Philadelphia and Delaware County area, but they have territory all throughout the Delaware Valley (i.e. the Philly metro area), including South Jersey and Wilmington.
Relevant evidence: No