Columbia subject headings:
Harvard subject headings:
Germany. Geheime Staatspolizei--History.
Intelligence officers--Germany--Biography.
Secret service--Germany--History--20th century.
Princeton subject headings:
Germany. Geheime Staatspolizei
Informers--Germany--Biography.
Sattler, Bruno, 1898-1972.
Socialists--Germany.
Sozialdemokratische Partei Deutschlands.