Columbia subject headings:
Harvard subject headings:
Agents provocateurs--Germany--History--1933-1945.
Germany. Geheime Staatspolizei--History.
Informers--Germany--History--1933-1945.
Secret service--Germany--History--1933-1945.
Princeton subject headings:
Agents provocateurs--Germany--History--1933-1945.
Germany. Geheime Staatspolizei--History.
Informers--Germany--History--1933-1945.