Home base: Colorado, USA
Criminal activities: Murder, assault, drug trafficking, intimidation, extortion, prostitution, money laundering, weapons trafficking
Considered one of the FBI's top five U.S. biker gangs, the Sons of Silence Motorcycle Club (SOSMC) has 30 chapters in 12 states, along with a growing contingency in Germany. They're reputed to have close to 300 full-patch members, and have on occasion been known to dabble in Nazi ideology and symbolism (chiefly that of white supremacy and bearing the swastika), although strong ties to the likes of the Aryan Brotherhood seem tenuous. The Sons of Silence might best be known for having been featured in a recent episode of the TV series Gangland.