The British code name assigned to Comintern wireless traffic exchanged between Moscow and numerous Communist parties across the globe between 1934 and 1937. The decrypted messages proved that the Kremlin controlled the Communist Party of Great Britain and its counterparts around the globe and showed that these supposedly independent political parties were simply instruments of Soviet foreign policy. Although the identities of individuals had been protected by cover names, MI5 succeeded in working out who the major players were.