Columbia subject headings:
Bund der Vertriebenen (Germany)
Germany (East). Ministerium für Staatssicherheit.
Political refugees--Germany (East)--History.
Political refugees--Germany (West)--History.
Subversive activities--Germany (East)--History.
Harvard subject headings:
Bund der Vertriebenen (Germany)--History.
Germany (East). Ministerium für Staatssicherheit--History.
Intelligence service--Germany (East)--History.
Political refugees--Germany (East)--History.
Political refugees--Germany (West)--History.
Subversive activities--Germany (East)--History.
Princeton subject headings: