Several well-known American public figures were spies during World War II, declassified documents have confirmed.
The celebrities include the chef Julia Child, the historian Arthur Schlesinger Jr, the film actor Sterling Hayden, and the baseball player Moe Berg.
The 750,000 documents published by the National Archives are part of a massive archive on the wartime intelligence unit, the Office of Strategic Services.
Founded in 1942, the OSS is considered to be a forerunner of the CIA.
It was responsible for collecting and analysing information required by the US military's Joint Chiefs of Staff, and for helping to organize guerrilla fighting, sabotage and espionage abroad.
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