Forty years ago, FBI chief J. Edgar Hoover recruited a band of professional killers for his private execution squad. He found them in organized crime families, the armed forces, and in other intelligence services. He called them the Unknowns, and they did jobs so dirty even the CIA was afraid of them. Now, for the first time anywhere, Mike Milan, a member of the Squad, tells the true story of Hoover's private war. Milan, who made his bones...