FBI (最佳回答10POINT)

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Beginning in the 1940s and continuing into the 1970s, the Bureau investigated cases of espionage against the United States and its allies. Eight Nazi agents who had planned sabotage operations against American targets were arrested, six of whom were executed (Ex parte Quirin). Also during this time, a joint US/UK code breaking effort (Venona) - with which the FBI was heavily involved - broke Soviet diplomatic and intelligence communications codes, allowing the US and British governments to read Soviet communications. This effort confirmed the existence of Americans working in the United States for Soviet intelligence. Hoover was administering this project but failed to notify the Central Intelligence Agency (CIA) until 1952. Another notable case is the arrest of Soviet spy Rudolf Abel in 1957. The discovery of Soviet spies operating in the US allowed Hoover to pursue his longstanding obsession with the threat he perceived from the American left, ranging from Communist Party of the United States of America (CPUSA) union organizers to American liberals with no revolutionary aspirations whatsoever.

FBI 曾在冷戰其間幫助英國及美國，解破蘇聯外交人員情報機關的密碼。

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