John Alexander Sinclair, head of the British Secret Intelligence Service from 1953 to 1956.
Sir John's retirement coincided with a failed frogman mission to investigate the Soviet cruiser Ordzhonikidze that had brought the leader of the Soviet Union Nikita Khrushchev and Prime Minister Nikolai Bulganin on a diplomatic mission to Britain, resulting in the death of frogman Lionel Crabb.
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