In the field of counterintelligence, a double agent (also double secret agent) is an employee of a secret intelligence service for one country, whose primary purpose is to spy on a target organization of another country, but who is now spying on their own country’s organization for the target organization. Listen to an audiobook on the topic for free: https://www.amazon.com/gp/search?ie=U…

 

Cassidy’s Run: https://amzn.to/3wiWANz

The Spy Who Stayed Out in the Cold: https://amzn.to/3wfko4W

The Bureau and the Mole: https://amzn.to/3CNCVb4

Triple Cross: https://amzn.to/3wiWFAR

Perfect Spy: https://amzn.to/3BHp6tf

Comrade J: https://amzn.to/31x11cp

Wiki briefs below video.

Double agentry may be practised by spies of the target organization who infiltrate the controlling organization or may result from the turning (switching sides) of previously loyal agents of the controlling organization by the target. The threat of execution is the most common method of turning a captured agent (working for an intelligence service) into a double agent (working for a foreign intelligence service) or a double agent into a re-doubled agent. It is unlike a defector, who is not considered an agent as agents are in place to function for an intelligence service and defectors are not, but some consider that defectors in place are agents until they have defected. Double agents are often used to transmit disinformation or to identify other agents as part of counter-espionage operations. They are often very trusted by the controlling organization since the target organization will give them true, but useless or even counterproductive, information to pass along.

https://en.wikipedia.org/wiki/Double_…

Aldrich Hazen “Rick” Ames (/eɪmz/; born May 26, 1941) is a former Central Intelligence Agency (CIA) officer turned KGB double agent, who was convicted of espionage in 1994. He is serving a life sentence, without the possibility of parole, in the Federal Correctional Institution in Terre Haute, Indiana, United States.[2] Ames was formerly a 31-year CIA counterintelligence officer who committed espionage against the U.S. by spying for the Soviet Union and Russia.[3] At the time of his arrest, Ames had compromised more highly classified CIA assets than any other officer in history until Robert Hanssen’s arrest seven years later in 2001.

https://en.wikipedia.org/wiki/Aldrich…

Operation Shocker was a 23-year counterintelligence operation run by the US Federal Bureau of Investigation against the Soviet Union. The operation involved the fake defection in place of a US Army sergeant based in Washington, D.C. who, in return for hundreds of thousands of dollars over two decades, provided information to Soviet intelligence (GRU) as agreed by the Joint Chiefs of Staff. This included over 4,000 documents on a new nerve gas the US believed unweaponizable, with the US intending to waste Soviet resources.

https://en.wikipedia.org/wiki/Operati…

Robert Philip Hanssen (born April 18, 1944) is an American former Federal Bureau of Investigation (FBI) double agent who spied for Soviet and Russian intelligence services against the United States from 1976 to 2001. His espionage was described by the Department of Justice as “possibly the worst intelligence disaster in U.S. history.”[3] Hanssen is currently serving 15 consecutive life sentences without parole at ADX Florence, a federal supermax prison near Florence, Colorado.

https://en.wikipedia.org/wiki/Robert_…

Ali Abdul Saoud Mohamed (Arabic: علي عبد السعود محمد) (born June 3, 1952) is a double agent[1] who worked for both the U.S. Central Intelligence Agency and Egyptian Islamic Jihad simultaneously, reporting on the workings of each for the benefit of the other.[2] He came to the United States working as a translator for Ayman al-Zawahiri who toured California in 1993 following the World Trade Centre bombing, hoping to raise money for al-Jihad from the numerous Islamic charities that still existed from the days of the Soviet occupation of Afghanistan. While there, Zawahiri encouraged him to infiltrate the United States, claiming to be defecting to the United States. When he simply walked into the CIA office in Cairo and asked to speak to the station chief to offer his services, the Americans assumed he was an Egyptian spy, but nevertheless recruited him to be a junior intelligence officer.[3] When tasked to infiltrate a mosque with ties to Hezbollah, he instead informed the imam he was an American spy intending to collect information. Another loyal American spy was also in the congregation and he reported Mohamed to the CIA, which dismissed him and sought to ban him from entering the United States.

https://en.wikipedia.org/wiki/Ali_Moh…)