Deeply infiltrating the gang.

Here's the story of Billy Queen, an ATF agent who infiltrated a dangerous motorcycle gang:

Retired now, Mr. Queen is supposed to be hiding in a witness protection program, but he popped up in Hollywood, in the heart of Mongols territory, swaggering around in a ball cap with A.T.F. spelled out in big white letters.

"Maybe I'm a little bit crazy," he supposed at an outdoor cafe and laughed in a sadistic little way, as if he were thinking of using his companion's eye for an ashtray just because it might be funny.

From the way he talks, Mr. Queen has not fully extricated his real life from his undercover persona of Billy St. John. He speaks fondly of those days, the parties, the camaraderie, the bullying of the Hell's Angels. He said that even though he was an undercover agent, he preferred to pal around with the Mongols on his days off because he was fond of them.