Definition: Five British citizens recruited as Communist spies before WWII: Anthony Blunt, Guy Burgess, John Cairncross, Donald Maclean and Kim Philby; diplomats Burgess & Maclean defected and Philby left the Secret Intelligence Service (SIS) in 1951, Blunt identified in 1964 but announced in 1979; involvement of Cairncross, a SIS ofificer was announced in 1990 [d] [e]
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