Columbia subject headings:
Rote Kapelle (Resistance group)
Spies--Soviet Union--Biography.
Trepper, Leopold, 1904-1982.
World War, 1939-1945--Secret service--Soviet Union.
Harvard subject headings:
Anti-Nazi movement--Germany
Military intelligence--Europe--History--20th century.
Military intelligence--Soviet Union--History--20th century.
Rote Kapelle (Resistance group)
Trepper, Leopold, 1904-1982.
World War, 1939-1945--Secret service--Soviet Union.
Princeton subject headings:
Rote Kapelle (Resistance group)
Spies--Soviet Union--Biography.
Trepper, Leopold, 1904-1982.
World War, 1939-1945--Secret service--Soviet Union.