Working under the codename "Sniper," Michal Goleniewski smuggled thousands of top-secret Soviet bloc intelligence and military documents from behind the Iron Curtain, and exposed more than 1600 Soviet agents operating in the West—more than any single spy in history. Then, in January 1961, he abandoned his family to defect to American territory with his girlfriend. But as Tim Tate notes here, Goleniewski was abandoned by the CIA because of his questionable trustworthiness, most notably when he bizarrely claimed to be Tsarevich Aleksei Romanoff, heir to the Russian Throne.