counterespionage > define
noun
- Spying on the spies. .
by WordNet 3.0 © 2006 by Princeton University
(DoD) That aspect of counterintelligence designed to detect, destroy, neutralize, exploit, or prevent espionage activities through identification, penetration, manipulation, deception, and repression of individuals, groups, or organizations conducting or suspected of conducting espionage activities.
by Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.