December 20–21, 1957, Moscow | General Multilateral Meetings
Celebrations marking the 40th anniversary of the security agencies of the Soviet Union (Cheka-KGB)
Participants: Albania, Bulgaria, China, Czechoslovakia, GDR, Hungary, Poland, Romania, Soviet Union (no information available on the full list of participants)
Documents:
Report of the Polish delegation
Polish
Archival sources:
AIPN, 1585/2063