Biker gangs are not considered terrorist organizations in the United States, but are instead classified as Outlaw Motorcycle Gangs by the Department of Justice. In terms of domestic terrorists, the Federal Bureau of Investigations specifically lists white supremacist groups, eco-terrorists, extremist militias, anarchic extremists and sovereign citizens' movements.
The DOJ lists more than 300 active Outlaw Motorcycle Gangs, which use their motorcycle clubs to help them carry out organized criminal activities, such as smuggling, prostitution, drug trafficking, human trafficking and extortion. According to the DOJ, the Outlaw Motorcycle Gangs that pose the most serious national domestic threat are the Hells Angels, Sons of Silence, Mongols, Outlaws and Bandidos.
The Hells Angels is one of the largest Outlaw Motorcycle Gangs in the world, with more than 200 chapters and 2,000 members in over 25 countries. The Hells Angels and the Bandidos are considered the two largest Outlaw Motorcycle Gangs in the United States. The Bandidos have more than 2,000 members in more than 13 different countries worldwide.
The Mongols is an extremely violent Outlaw Motorcycle Gang that consists mostly of Hispanic males. Their main rival is the Hells Angels, and the Mongols are united with the Sons of Silence, Bandidos, Pagans and Outlaws. In the 1980s, the Mongols took over control of southern California from the Hells Angels and also control much of the southwestern and western United States.