Discover published sets by community

Discovered in the 1950s-1960s; significantly impacted UK-US relations and caused distrust within the intelligence community.

Arrested in 1994; the case brought the vulnerability of the CIA into the spotlight and strained US-Russia relations post-Cold War.

Convicted in 1951; their execution marked the first time in American history that civilians were executed for espionage, heightening Cold War tensions.

Arrested in 1985; his espionage acts against the United States for Israel stirred complex issues between the two nations.

Arrested in 2001; his case revealed severe lapses in FBI security, leading to a reevaluation of counterintelligence practices.

Uncovered in 2010; this network of Russian sleeper agents in the US led to the largest spy swap since the Cold War.

Revealed information in 1986; his disclosures about Israel's nuclear capabilities had a lasting impact on Middle East politics and Israel's foreign relations.

Defected in 1951; their defection revealed the extent of Soviet infiltration in British Intelligence and impacted Anglo-Soviet relations.

Compromised in 1956; a joint US-UK tunnel into East Berlin for intelligence gathering, its disclosure by George Blake damaged Western intelligence efforts.

Arrested in 2001; her spying for Cuba questioned the effectiveness of US counterintelligence and influenced US-Cuba policy.

Arrested in 1941; Sorge's information on German intentions was crucial in the USSR's preparation for the German attack, influencing the course of WWII.

Arrested in 1961; his leadership of a Soviet spy ring in Britain led to concerns about KGB operations in the West and affected UK-Soviet relations.

Arrested in 1957; this Soviet spy's concealment of messages in coins showed the ingenuity of espionage techniques and the Cold War's covert battles.

Arrested in 1984; the couple spied for Czechoslovakia and the Soviet Union while attending CIA functions, deepening concerns over Eastern Bloc espionage.

Arrested in 1985; his spy ring provided the Soviet Union with US Navy secrets, causing a reevaluation of maritime strategy during the Cold War.

Exposed in the 1980s-90s; linking CIA mole Aldrich Ames and FBI mole Earl Pitts, this case illustrated the complexity of internal espionage threats.

Exposed in 1983; the leak of KGB technological espionage operations caused significant disruptions in Soviet intelligence and technological development.

Convicted in 1987; the first US Marine to be convicted of spying against the US at an embassy, his actions led to tighter security protocols in embassies worldwide.

Revealed in 1963; Information provided by GRU Colonel Oleg Penkovsky to the US and UK was crucial during the Cuban Missile Crisis.

Arrested in 1979; his espionage for the Soviet Union while working in Swedish intelligence alerted the West to vulnerabilities in non-NATO countries.

Convicted in 1957; Soviet intelligence officer operating in the United States, his capture was later exchanged for U-2 pilot Francis Gary Powers.

Arrested in 1985; his spying for China while working for the CIA revealed the depth of Chinese infiltration and influenced Sino-American relations.

Arrested in 1996; his spying for Russia as an FBI agent showed the ongoing espionage threats in the post-Cold War era.

Exposed in 1985; This espionage ring caused a seismic shift in naval communications and forced the US to overhaul its codes and encryption machines.

Convicted in 1986; his involvement in the Walker Spy Ring compromised US naval codes, leading to an extensive review of security protocols.

Arrested in 1998; his sale of secrets to the USSR in the late Cold War era illuminated the ongoing threat of ideology-driven espionage.

Convicted in 1985; her betrayal as a CIA clerk in Ghana led to the exposure of CIA agents in Africa and compromised US intelligence operations.

Arrested in 1980; his copying of sensitive documents for the KGB revealed the risk of espionage in the translation services.

Convicted in 1989; his espionage for East Germany and the Soviet Union dealt a significant blow to US electronic intelligence capabilities.

Arrested in 1996; his arrest was significant as he was the highest-ranking CIA officer to be convicted of espionage, indicative of the extent of security breaches.