counterintelligence
/ˌkaʊntərɪnˈtɛlədʒəns/
noun
- Activities designed to prevent an enemy from gathering information about a country or organization, and to deceive or disrupt the enemy's intelligence efforts.
- Counterintelligence operations often involve double agents and misinformation.
- The agency's counterintelligence unit worked to identify foreign spies.
- He was trained in counterintelligence to protect national secrets.