Counterintelligence consists of activities designed to prevent intelligence gathering from foreign intelligence entities. The purpose of counterintelligence is to detect and counter growing security threats. In the United States, there are several organizations that conduct counterintelligence measures daily; however, the two most prominent organizations are the Central Intelligence Agency (CIA) for international counterintelligence and the Federal Bureau of Investigation (FBI) for domestic counterintelligence. While U.S. counterintelligence has existed since the American Revolution, counterintelligence measures reached a new level of prominence and sophistication with the Cold War.

The Cold War

U.S. counterintelligence during the Cold War was largely characterized by attempts to monitor the Soviet Union, the United States’ major state adversary during this time period. U.S. counterintelligence during the Cold War was characterized by both failures ...

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