Columbia subject headings:
Intelligence service--Soviet Union--Sources.
National security--Soviet Union--Sources.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History--Sources.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History--Sources.
World War, 1939-1945--Secret service--Soviet Union.
World War, 1939-1945--Soviet Union--Sources.
Harvard subject headings:
Intelligence service--Soviet Union--History--Sources.
National security--Soviet Union--History--Sources.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History--Sources.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History--Sources.
World War, 1939-1945--Secret service--Soviet Union--Sources.
World War, 1939-1945--Soviet Union--Sources.
Princeton subject headings:
Intelligence service--Soviet Union--History--Sources.
National security--Soviet Union--History--Sources.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History--Sources.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History--Sources.
World War, 1939-1945--Secret service--Soviet Union--Sources.
World War, 1939-1945--Soviet Union--Sources.