The Mongols were formed in the 1970s in Montebello, outside of Los Angeles, by a group of Latino men who reportedly had been rejected for membership by the Hells Angels motorcycle gang. It has expanded over the decades to include several hundred members who thrive on their identity as outlaws. Dozens of members have been convicted of an array of crimes, including the killings of rival biker gang members, assaults and drug dealing.
Source: latimes.com – Los Angeles Times