Cipher clerk at USSR Embasse in Ottawa. Defected, with his wife Svetlana and son, to Canada in 1946, having stolen and copied as much information from the Embassy as he could. At first the Canadians didn't know what to do with him and were embarrassed (esp. PM Mackenzie King) to upset Stalin. Gouzenko was instrumental in tracking down a number of important spies in US, Canada, and to a lesser extent, Britain. He brought information that spies for US were routinely infiltrated through Canada, using passports of Canadians who had died in the Spanish Civil War.
His most significant warning was against a high level spy in the British MI5, codenamed ELLI. At first, he refused to talk about ELLI to anyone except a high-level British intelligence expert who has not been identified and whom he knew as "the gentleman from Britain." That person may have been Hollis and was surely himself a spy who suppressed the information.
Never out of protective custody and no actual picture of him published until after his death. He was blind from 1973 so could not identify the "gentleman from England" to whom alone at first, he had entrusted his description of the highup traitor in London-ELLI. Gouzenko lived the rest of his life (died 1982) in Canada under another name. No picture of him was published until after his death and even his children did not know who he was--all for fear of Soviet reprisals.
