Columbia subject headings:
Harvard subject headings:
Spies--Soviet Union--Biography.
Trepper, Léopold, 1904-1982.
World War, 1939-1945--Secret service--Soviet Union.
Princeton subject headings:
Espionage--Germany--History--20th century.
Spies--Germany--Biography.
Trepper, Leopold, 1904-1982.
World War, 1939-1945--Secret service--Germany.