The Hells Angels have been around since 1950 after a group splintered from an MC called the "Pissed Off Bastards of Bloomington" and revamped themselves the Hells Angels, named for a World War II bomber, according to The State of California's Department of Justice Bureau of Organized Crime and Criminal Intelligence. Since then, the motorcycle club has evolved into an alleged 2,500-member international criminal enterprise involved in all manner of crime ranging from drug trafficking to murder, per Complex. 

According to the Hells Angels website, the club now spans five continents and 59 countries. 

The Mongols, an MC that has been around for 47 years, according to its website, notes that they have been "under Federal Indictment for nine years." Besides the usual drug trafficking, the gang is known to use intimidation, assault, and murder to defend their claimed territories in Southern California, which they seized from the Hells Angels in the 1980s, per the DOJ.

The Mongols are allies with the highly dangerous Bandidos, the Pagans, and the Sons of Silence against the Hells Angels, adds the DOJ.

The gang is mostly comprised of "Hispanic males," many with a history of being members of street gangs. The Bureau of Alcohol, Firearms, and Tobacco has said the Mongols are "the most violent and dangerous OMG in the nation," per the DOJ. 

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