Columbia subject headings:
Communism--Europe--History.
Communism--History--19th century.
Communism--History.
Jaurès, Jean, 1859-1914.
Kautsky, Karl, 1854-1938.
Socialism--Europe--History.
Harvard subject headings:
Princeton subject headings:
Communism.
Marx, Karl, 1818-1883.
Socialism.