Columbia subject headings:
Civil rights.
Law and ethics.
Libertarianism.
Liberty.
Harvard subject headings:
Civil rights
Hobbes, Thomas, 1588-1679--Ethics.
Kant, Immanuel, 1724-1804--Ethics.
Law and ethics.
Liberalism--History
Liberty
Liberty--Philosophy
Political science--Philosophy
Social contract--History.
State, The--Philosophy
Princeton subject headings:
Liberty--Philosophy.
Political science--Philosophy.