Columbia subject headings:
Intelligence service--Russia (Federation)--History.
Intelligence service--Soviet Union--History.
Military intelligence--Soviet Union--History.
Secret service--Soviet Union--History.
Soviet Union--Diplomatic history.
Harvard subject headings:
Intelligence service--Russia (Federation)--History.
Intelligence service--Soviet Union--History.
Military intelligence--Soviet Union--History.
Secret service--Soviet Union--History
Princeton subject headings:
Intelligence service--Russia (Federation)--History.
Intelligence service--Soviet Union--History.
Military intelligence--Soviet Union--History.
Secret service--Soviet Union--History.
Soviet Union--Diplomatic history.