Columbia subject headings:
Communism.
Existentialism.
Merleau-Ponty, Maurice, 1908-1961.
Sartre, Jean-Paul, 1905-1980.
Harvard subject headings:
Communism and philosophy.
Existentialism.
Marx, Karl, 1818-1883
Merleau-Ponty, Maurice, 1908-1961--Political science.
Sartre, Jean-Paul, 1905-1980--Political science.
Princeton subject headings: