SOUTHERN CALIFORNIA — Former Bureau of Alcohol, Tobacco, and Firearms agent Billy Queen completed a two-year undercover infiltration of the Mongols, a biker gang in Southern California, in 2000, resulting in 54 arrests and 53 convictions. The operation dismantled the Mongols organization and exposed gaps in how agencies managed long-term undercover assignments, prompting revisions to protocols for such operations.

Queen, who had worked undercover for the ATF for nearly two decades, was originally assigned to infiltrate the gang on a mission expected to last a few months. Within the first few months, the mission escalated beyond its original scope and ultimately stretched to two years. Operating under the alias Billy St. John, he became a trusted member of the gang and was appointed its secretary-treasurer, a role that gave him access to the group's criminal activities across the United States.

During his infiltration, Queen witnessed gun running, brutal beatings, rape, and murder by gang members. He lost contact with his children, girlfriend, friends, and colleagues during the operation, and after about eighteen months, he had no contacts outside the gang members he associated with and only limited contact with his ATF handler.

"I'd lost everything. I didn't have a personal life anymore," he said. When he flew across the country to bury his mother, ATF personnel upon his return told him only to go back to the gang and did not acknowledge his loss. Numerous gang members, by contrast, hugged him, expressed love, and apologized for his loss when he returned.

Two years into the operation, Queen left the gang and immediately entered a witness protection program run by the ATF. He was relocated to Texas under a new identity while his family was relocated to Florida. The ATF told him it would fly his children to visit him while he awaited testimony. Over the next two years, he saw his children once. Mongols members actively looked for him and threatened to kill him.

The case prompted agencies to begin using teams rather than relying on a single operative for deep undercover work. Agencies also became more cautious about assigning agents with families to extended undercover roles.

Queen no longer lives in hiding but relies on constant awareness and personal protection. "Had I known what it was going to cost me, I'd have never done that," he said. He said he still faces a risk to his life from former Mongols members.