Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1933-1945--Congresses.
National socialism--Congresses.
Nazi concentration camps--Germany--History--Congresses.
Political persecution--Germany--History--20th century--Congresses.
Political violence--Germany--History--20th century--Congresses.
Princeton subject headings:
Germany--Politics and government--1933-1945--Congresses.
Nazi concentration camps--Germany--History--Congresses.
Political prisoners--Germany--History--20th century--Congresses.
Socialists--Germany--History--Congresses.
World War, 1939-1945--Concentration camps--Germany--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.