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
  1. noun
    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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