'aryan brotherhood'

from national geographic: The Aryan Brotherhood, (also known as the AB or The Brand) is a prison gang numbering about 15,000 members in and out of prison. In March 2006, four leaders of the Aryan Brotherhood were indicted for numerous crimes, including murder, conspiracy, drug trafficking, and racketeering. According to the FBI, the gang is responsible for up to 20% of murders in the federal prison system.