Columbia subject headings:
Intellectuals--Political activity--Congresses.
Liberalism--Congresses.
Social participation--Congresses.
Harvard subject headings:
Intellectuals--Political activity--Congresses.
Liberalism--Congresses
Social participation--Congresses.
Princeton subject headings:
Intellectuals--Political activity--Congresses.
Liberalism--Congresses.
Social participation--Congresses.