A courier who bridged the gap between a physicist's betrayal and Moscow's archives spent 15 years in prison after a record kept secret for decades mapped the route of atomic leaks.
A Quaker relief worker's role as a conduit for the Soviet atomic spy remained buried in a file labeled 'Pacifists' for decades, masking a network that stretched from Berlin to Los Alamos.
The identity of the man who facilitated the theft of nuclear calculations in 1946 was matched to a dossier in 1950, but the source of that identification remains redacted.
A German refugee and mathematician was cast into the orbit of the Soviet atomic spy Klaus Fuchs, leaving a trail of surveillance that ended in a suspicious archival silence
A member of the Communist Party spent years insulating a nuclear spy from the state; the Security Service kept the details of his 'legal help' in a personal file for decades.
A woman with four identities spent years navigating the London social scene, masking a link between the BBC's Russian section and the Soviet spy who stole the atomic secret.
A package left in a Surrey garden once held the secrets of the atomic age, while three disciplined Communists maintained a wall of silence that MI5 could not breach.
Atomic secrets were siphoned to Moscow through an academic pipeline of German communists, leaving the British state blind to the penetration of its most sensitive laboratories.
A physicist's wife slept with a Soviet spy while her husband oversaw the security of Britain's nuclear program, creating a web of intimacy that drew the attention of the Security Service.
He handed over "detailed and damaging" nuclear data for years, yet his 14-year sentence rested entirely on a confession elicited by the Security Service after a US source spoke.
He volunteered his services to the Russians in 1942, compromising the most guarded secret of the West before a sensitive US source finally tripped the wire.
A British security file describes how an economist and an associate steered a physicist toward betrayal, a connection that expedited the Soviet atomic bomb.
He spent years in the heart of the Manhattan Project betraying allies to the KGB and GRU; his 1950 conviction relied on a confession because investigators found no evidence.
A British citizen lost his nationality after providing damaging nuclear data to the KGB and GRU, though the investigation that caught him produced no physical evidence of espionage.
Soviet agents used a German economist to compromise the British atomic project, a betrayal tracked in Security Service files categorized as "Soviet Intelligence Agents and Suspected Agents."