The Hells Angels Motorcycle Club (HAMC) is an international outlaw motorcycle club whose members typically ride Harley-Davidson motorcycles. In the United States and Canada, the Hells Angels are incorporated as the Hells Angels Motorcycle Corporation. Common nicknames for the club are the "H.A.", "Red & White", and "81". With a membership of over 6,000, and 592 charters in 66 countries, the HAMC is the largest "outlaw" motorcycle club in the world.
https://en.wikipedia.org/wiki/Hells_Angels