Columbia subject headings:
Frankfurt am Main (Germany)--History--20th century.
Germany. Geheime Staatspolizei. Staatspolizeistelle Frankfurt (Main)
Nazis--Germany--Frankfurt am Main.
Harvard subject headings:
Frankfurt am Main (Germany)--History
Germany. Geheime Staatspolizei. Staatspolizeistelle Frankfurt (Main)
Nazis--Germany--Frankfurt am Main.
Princeton subject headings:
Frankfurt am Main (Germany)--History--20th century.
Germany. Geheime Staatspolizei. Staatspolizeistelle Frankfurt (Main)
Police--Germany--Frankfurt am Main.
Political crimes and offenses--Germany--Frankfurt am Main.