The Sons of Silence Motorcycle Club (SOSMC) is a one-percenter motorcycle gang that was founded in Niwot, Colorado in the United States in 1966. The first chapter outside of Colorado was the Iowa chapter which was founded in 1968. There are now American chapters in Arkansas, Florida, Illinois, Indiana, Kansas, Kentucky, Louisiana, Minnesota, Mississipi, North Dakota and Wyoming. The first foreign chapter was founded in Munich, Germany in 1998. In 2001, more German chapters were founded in Freising, Gangkofen and Nurnberg. In November 2007, a Viernheim chapter was founded.