Columbia subject headings:
Harvard subject headings:
Germany. Geheime Staatspolizei. Staatspolizeistelle Frankfurt (Main)--Congresses.
Nazis--Germany--Frankfurt am Main--Congresses.
Princeton subject headings:
Anti-Nazi movement--Germany--Frankfurt am Main--Congresses.
Germany. Geheime Staatspolizei--Congresses.
National socialism--Germany--Frankfurt am Main--Congresses.
Political atrocities--Germany--Frankfurt am Main--Congresses.
Torture--Germany--Frankfurt am Main--Congresses.