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The official state security service of the German Democratic Republic (East Germany). It was known for its extensive network of informants and repressive surveillance tactics.

Equivalent to Operation Gold, Operation Stopwatch was the British name for the joint intelligence operation aiming to tap into Soviet communications via a tunnel in Berlin.

A joint US-UK tunnel operation in Berlin to tap Soviet army communication lines. The Soviets were tipped off by a mole, George Blake, and allowed the operation to continue for intelligence purposes.

CIA officer turned KGB mole who compromised the second-largest number of CIA assets. Ames was arrested in 1994 and his betrayal led to significant reforms in the CIA.

An espionage case based around a Russian spy network in the US that used hollow coins to pass messages. The case became famous when a young boy found one of these coins.

A group of British double-agents working for the Soviet Union, including Kim Philby, Guy Burgess, Donald Maclean, Anthony Blunt, and John Cairncross. Their espionage activities had significant impacts on both UK and US intelligence operations.

Julius and Ethel Rosenberg were American citizens executed for espionage in 1953, accused of passing atomic secrets to the Soviet Union.

A colonel in Soviet military intelligence who spied for the UK and the US, providing key information during the Cuban Missile Crisis before being caught and executed in 1963.

An American spy for the Soviet Union who later became an informer for the US, her defection and testimonies exposed Soviet espionage and helped to fuel McCarthyism.

A German journalist and Soviet military intelligence officer who provided crucial information to the Soviet Union, including alerts about the German invasion during WWII. While not during the Cold War, his work influenced espionage strategies in the period.

A secret collaboration between the US and UK to decrypt messages sent by Soviet intelligence. It led to the discovery of numerous spies, including Julius and Ethel Rosenberg.

A high-ranking member of British intelligence and a member of the Cambridge Five spy ring, Philby defected to the Soviet Union in 1963 after being exposed as a Soviet agent.

A British double agent who worked as a mole for the Soviet Union, Blake infamously betrayed the Operation Gold tunnel project and latter escaped from British prison to the USSR.