Columbia subject headings:
Harvard subject headings:
Police--Germany--History--20th century--Congresses.
Police--History--20th century--Congresses.
Power (Social sciences)--History--20th century--Congresses.
State, The--History--20th century--Congresses.
Violence--Germany--History--20th century--Congresses.
Violence--History--20th century--Congresses.
Princeton subject headings:
Authority.
Police, State--20th century.
Police--20th century.
Power (Social sciences)
State, The--20th century.