Operation One Percenter was a nationwide federal investigation into organized crime activity by outlaw motorcycle gangs conducted by the United States Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).

[2][3][4] According to federal law enforcement, biker gangs dominated the trade of manufactured drugs such as methamphetamine and PCP, and were also involved in contract killing, extortion, prostitution, firearms trafficking, car theft and witness intimidation, often in collusion with traditional organized crime families.

[5][10] On March 27, 1986, a further 53 motorcycle gang members and associates were arrested in an eighteen-state dragnet, on various charges including violations of federal firearms and explosives laws, conspiracy and drug trafficking.

[5] Raids were carried out in California, Idaho, Nevada, Arizona, New Mexico, Texas, Minnesota, Louisiana, Alabama, Tennessee, Indiana, Georgia, Michigan, Maryland, New York, Vermont, Massachusetts and New Hampshire.

[1] The six motorcycle gang chapter presidents arrested in Operation One Percenter were James Atkins (Bandidos, Texarkana, Arkansas); Francis Attardo (Trampers, Boston, Massachusetts); Christopher Curvin (Nomads, Mansfield, Massachusetts); Patrick Matter (Hells Angels, Minneapolis, Minnesota); Ronald Neal (Devils Diciples, Birmingham, Alabama); and Charles Simpson (Outlaws, Nashville, Tennessee).