Home base: Fontana, California, USA
Criminal activities: Drugs (production, transportation and distribution), assault, extortion, murder, money laundering, motorcycle theft
Easily the most notorious biker gang in the world, the Hells Angels operate in as many as 27 countries and pose "a criminal threat on six continents." What else would you expect from one of the most recognizable biker gangs in the world, one with so many legends attached to it that it's impossible to sort out truth from myth? Full-patch membership -- limited to white males who cannot be into child molestation -- is estimated to be under 4,000, although they're supported by a multitude of puppet clubs (like the Original Kings) and even some female clubs (like the Devil Dolls).
Perhaps you've noticed the motif in some of the previous entries -- namely that many of the most notorious biker gangs operating right now are flat-out hostile with the Hells Angels. But when you're clear and free at the top, who needs allies?