Columbia subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Dutschke, Rudi, 1940-1979--Congresses.
Radicals--Germany--Congresses.
Harvard subject headings:
Bloch, Ernst, 1885-1977
Civil society.
Dutschke, Rudi, 1940-1979.
Princeton subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Communists--Germany--Congresses.
Dutschke, Rudi, 1940-1979--Congresses.
Radicalism--Germany--Congresses.