Columbia subject headings:
Communism--Europe--Congresses.
Democracy--Congresses.
Europe--Politics and government--1945---Congresses.
Social justice--Congresses.
Socialism--Europe--Congresses.
Harvard subject headings:
Communism--Europe--Congresses
Democracy--Congresses
Europe--Politics and government--1945---Congresses.
Social justice--Congresses
Socialism--Europe--Congresses
Princeton subject headings: