Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Espionage--Germany--Berlin--History--20th century.
Germany (East). Ministerium für Staatssicherheit.
Political kidnapping--Germany (West)
Political kidnapping--Germany--Berlin--History.
Secret service--Germany (East)
Princeton subject headings:
Germany (East). Ministerium für Staatssicherheit
Kidnapping--Germany (West).