Outlaw or "one-percent" motorcycle gangs have been a scourge to the federal government since the 1960s. To this day, there are formidable motorcycle clubs (MCs) on both coasts, and one-percenters run drugs across the Canadian and Mexican border. Though Americans have long mythologized biker culture with the help of books like Hunter S. Thompson's Hell's Angels and television shows like Sons of Anarchy, outlaw motorcycle clubs continue to play a very real roll in American organized crime.

In the past few years, we've seen major stings that yielded charges of drug trafficking, racketeering, and contract killing for motorcycle gang members. Former ATF agent Jay Dobyns' book about infiltrating the Hells Angels, No Angel: My Harrowing Undercover Journey to the Inner Circle of the Hells Angels was published in 2009, and Dobyns was the target of harassment from clubs as recently as 2008. Outlaw motorcycle gangs are alive and well in the U.S., and the federal government continues to battle their influence. Learn the basics with The 10 Most Dangerous Motorcycle Gangs in America.

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