Columbia subject headings:
Harvard subject headings:
Military intelligence--Soviet Union--History--20th century.
Soviet Union. Glavnoe razvedyvatelʹnoe upravlenie--History.
Spies--Soviet Union--Biography.
Princeton subject headings:
Military intelligence--Soviet Union--History--20th century.
Soviet Union. Glavnoe razvedyvatenoe upravlenie--History.
Spies--Soviet Union--Biography.