Columbia subject headings:
Lenin, Vladimir Ilʹich, 1870-1924.
Marx, Karl, 1818-1883.
Social conflict.
Harvard subject headings:
Lenin, Vladimir Ilʹich, 1870-1924
Marx, Karl, 1818-1883
Social conflict.
Princeton subject headings:
Lenin, Vladimir Ilʹich, 1870-1924.
Marx, Karl, 1818-1883.
Social conflict.