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Irvin Chambers Scarbeck (born May 8, 1920) was a US State Department official who was convicted of giving information to Polish UB (secret police) during the Cold War after he became involved in a romantic affair with a Polish woman and was blackmailed by Polish intelligence agents. His case was the first prosecution under Title 50 783(b) of the Subversive Activities Control Act. His case also prompted a modification of the Espionage Act of 1917 to allow it to be used outside U.S. territory.