Information and activity that helps to expose or eliminate spying or terrorist threats is counterintelligence. One of the things the CIA is responsible for is counterintelligence.

Governments spy on each other, and the action of spying is called intelligence or espionage. When a country works to oppose or uncover spying, it's counterintelligence, or counterespionage. In the United States, both the CIA and the FBI have counterintelligence units. The word has been used since 1940, from counter, "against," and intelligence, from the Latin intelligentia, "power of discerning." The sense of intelligence as "secret information from spies" dates from the 16th century.

Definitions of counterintelligence

n intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism

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spying on the spies
security intelligence
intelligence on the identity and capability and intentions of hostile individuals or organizations that may be engaged in espionage or sabotage or subversion or terrorism
censoring, censorship, security review
counterintelligence achieved by banning or deleting any information of value to the enemy
the aspect of counterintelligence designed to detect and prevent subversive activities
counterintelligence designed to detect and counteract sabotage
military censorship
all types of censorship conducted by personnel of the armed forces
national censorship
censorship under civil authority of communications entering or leaving of crossing the borders of the United States or its territories or possessions
Type of:
intelligence, intelligence activity, intelligence operation
the operation of gathering information about an enemy

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