Guy Francis de Moncy Burgess was a British diplomat and Soviet agent, belonging to the Cambridge Five spy ring that operated from the mid-1930s to the early years of the Cold War.
In 1950, he was appointed second secretary to the British Embassy in Washington, a post from which he was sent home after repeated misbehaviour. Although not at this stage under suspicion, Burgess nevertheless accompanied Maclean when the latter, on the point of being unmasked, fled to Moscow in May 1951.