A German national operating under a Soviet cover in London vanished into the United States just as the war began, her movements tracked by the Security Service in files that remain partially obscured.
By Constance Bell ·
A German doctor used a journalist's alias to navigate the Comintern's hidden networks while the Security Service tracked his "possible" ties to Soviet intelligence.
By Harlan Pryce ·
Kept secret in the files of the British Security Service, this record links the leader of the American Communist Party to a network of aliases and espionage that spanned the Atlantic.
By Harlan Pryce ·
For decades, the U.S. government held a mirror to its own infiltration, keeping the decryption of Soviet telegrams secret while agents stole the atomic bomb.
By Vera Kessler ·