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)
21St Century Counterintelligence by 
Brassey's Book of Espionage by 
Counterintelligence and Insider Threats: How Prepared is the Department of Homeland Security? by 
The Counterintelligence Chronology by 
A Counterintelligence Reader, Volume I by 
Counterintelligence Theory and Practice by 
Dirty Tricks or Trump Cards by 
Encyclopedia of Intelligence and Counterintelligence by 
Historical Dictionary of Cold War Counterintelligence by 
Historical Dictionary of Sexspionage by 
The Second Oldest Profession by 
The Secret World : A History of Intelligence by 
A Short Course in the Secret War by 
Spies, Wiretaps, and Secret Operations by 
Spies and Provocateurs by 
Spy Book, 2nd Edition by 
Strategic Denial and Deception by 
Thwarting Enemies at Home and Abroad by U.S. Counterintelligence : From the year of Intelligence to the Year of the Spy and Poised for the Future by 
U.S. Counterintelligence: The Foundations of Strategy and Espionage Realities by 
Vaults, Mirrors, and Masks by Subject Specialist:
Special Agent Victor Melendez
NCIS
Subject Librarian:
Andrea Groce
Research & Instruction Librarian
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.
James Olson, former CIA Chief of Counterintelligence, sits down with International Affairs to have a casual discussion on intelligence and current affairs. 24 Mar 2023.
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.
Animated film held by the National Archives and Records Administration. 2011.
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.
Articles
Books
Historical Dictionary of Sexspionage by Media
Video, Cold War Spy Documentary. Timeline World History.
Audio, speech given at the International Spy Museum, 2009.
