UK officials spent decades hiding how the VENONA project exposed Soviet agents in Australia to protect a cryptographic secret and shield high-level leaks from the public record.
A high-ranking diplomat spent years funneling secrets to Moscow before fleeing to Prague under a medical pretext; he remained under investigation until a 1954 defection exposed him.
He used a UN post and a Rhodes scholarship to mask his work for Moscow, with a sudden 1950 move to Prague that stayed under active investigation for years.
A physicist's ties to the Communist Party and a tip from a Soviet defector kept him under British surveillance for a decade before he broke with Moscow in 1957.
An academic's journey from the UN Secretariat to Prague remained hidden in Security Service files as he allegedly traded state secrets for Soviet favor.
His kinship with the MGB cost him an Oxford scholarship and placed him under the gaze of the Security Service, a record held in files tracking suspected communists.
A physicist’s Oxford scholarship was stripped for his Party ties before a Soviet defector linked him to the MGB, records kept by the Security Service show.