Question: In what year was the spy captured in the same five year period as Julius and Thel Rosenberg born?
Sentence (from "Cold War (1947–1953)"): Political relations between the USA, Britain, Canada and the USSR were tainted within days of VJ-Day when cipher clerk Igor Gouzenko defected from the Soviet embassy in the Canadian capital, offering documentary proof of two wartime networks of Soviet spies in North America, one aimed at the Manhattan Project.
Relevant evidence: No