Columbia subject headings:
Authorship--Political aspects--Congresses.
Censorship--Congresses.
Civil rights--Congresses.
Politics and literature--Congresses.
Harvard subject headings:
Authorship--Political aspects--Congresses.
Censorship--Congresses.
Civil rights--Congresses
Politics and literature--Congresses.
Princeton subject headings:
Authorship--Political aspects--Congresses.
Censorship--Congresses.
Civil rights--Congresses.
Politics and literature--Congresses.