Columbia subject headings:
Liberty--Congresses.
Political science--Philosophy--History--Congresses.
Harvard subject headings:
Compulsive behavior--History--Congresses.
Liberty--History--Congresses.
Political science--Philosophy--Congresses
Social change--History--Congresses.
Social control--History--Congresses.
Social pressure--History--Congresses.
Princeton subject headings:
Liberty--Congresses.
Political science--Philosophy--History--Congresses.