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Crisis Response

British arrest of physicist Klaus Fuchs for atomic espionage

British authorities arrested Klaus Fuchs on suspicion of passing atomic secrets to the Soviet Union; he later confessed to espionage.

British arrest of physicist Klaus Fuchs for atomic espionage

Fuchs's arrest confirmed serious penetration of Allied nuclear research, intensified U.S.-U.K. security cooperation and contributed to expanded anti-espionage efforts during Truman's administration.

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