Counterintelligence is Information gathered and activities conducted to protect against espionage, other intelligence activities, sabotage, or assassinations conducted by or on behalf of foreign governments or elements thereof, foreign organizations, or foreign persons, or international terrorist activities. (Dictionary of Military & Associated Terms)
Counterintelligence has both a defensive mission - protecting the nation's secrets and assets against foreign intelligence penetration - and an offensive mission - finding out what foreign intelligence organizations are planning to better defeat their aims. (From www.dni.gov)
Film explaining surveillance techniques, Checkpoint Charlie, and cooperation with proper civil authorities. National Archives. 1969.
Interview with ex-KGB officer and Soviet defector Yuri Bezmenov who decided to openly reveal KGB's subversive tactics against western society as a whole.
Foreign Policy Association panel discussion on various CI issues. May 2017.
Remarks on Counterintelligence from William M. Nolte, former Director of Education and Training at the Office of the Director of National Intelligence. The Institute of World Politics, 7 Feb 2014.
Talk by Dr. David Robarge, chief historian of the Central Intelligence Agency. 2014.
James M. Olson, former chief of CIA counterintelligence, offers a wake-up call for the American public and also a guide for how our country can do a better job of protecting its national security and trade secrets. June 2020.
Video on spies in America throughout the years. May 2018.
Video, Cold War Spy Documentary. Timeline World History.
Audio, speech given at the International Spy Museum, 2009.