The SOLO File:
Washington, D.C., April 10, 2012 – The "FBI's most valued secret agents of the Cold War," brothers Morris and Jack Childs, together codenamed SOLO, reported back to J. Edgar Hoover starting in 1958 about face-to-face meetings with top Soviet and Chinese Communist leaders including Mao and Khrushchev, while couriering Soviet funds for the American Communist Party, according to newly declassified FBI files cited in the new book by Tim Weiner, Enemies: A History of the FBI (New York: Random House, 2012).