Manifesto: Towards a Free Revolutionary Art
True art, which is not content to play variations on ready-made models but rather insists on expressing the inner needs of man and mankind in its time--true art is unable not to be revolutionary, not to aspire to a complete and radical reconstruction of society.
Andre Breton and Leon Trotsky, Generation Online, 1938

The Work of Art in the Age of Mechanical Reproduction
The transformation of the superstructure, which takes place far more slowly than that of the substructure, has taken more than half a century to manifest in all areas of culture the change in the conditions of production. Only today can it be indicated what form this has taken.
Walter Benjamin, Marxists.org, 1936