Counterintelligence (counter-intelligence) or counterespionage (counter-espionage) is any activity aimed at protecting an agency's intelligence program from an opposition's intelligence service. It includes gathering … See more

Collective counterintelligence is gaining information about an opponent's intelligence collection capabilities whose aim is at an entity.
Defensive … See more

Frank Wisner, a well-known CIA operations executive said of the autobiography of Director of Central Intelligence Allen W. Dulles, that Dulles "disposes of the … See more

Offensive techniques in current counterintelligence doctrine are principally directed against human sources, so counterespionage … See more

Modern tactics of espionage and dedicated government intelligence agencies developed over the course of the late-19th century. A key background to this development was the See more

Many governments organize counterintelligence agencies separately and distinct from their intelligence collection services. In most countries the counterintelligence mission is spread over multiple organizations, though one usually predominates. … See more

In U.S. doctrine, although not necessarily that of other countries, CI is now seen as primarily a counter to FIS HUMINT. In the 1995 US Army counterintelligence manual, CI had a broader … See more