Territory: Nationwide (Strongest presence in California)
Approximate membership:  2,500

When you think about outlaw motorcycle clubs, you probably think of the Hells Angels. This gang has become so well known that it’s actually incorporated in the U.S. and Canada. (Business dealings include suing movies like Wild Hogs for copyright infringement).

Legal businesses aside, the roughly 2,500 hardcore members of this club deal in every manner of criminal pursuit, from wide scale drug dealing to racketeering. Their aggressiveness has led to long-simmering feuds with many of the other clubs on this list, including the Mongols in Southern California and the Outlaws along the Canadian border. These guys are the best-known one-percenter gang for a reason.