Edouard Manet, "The Railroad," 1872-3 (National Gallergy of Art, Washington).
Pierre-Auguste Renoir, "Le Moulin de la Galette," 1876. Musée d'Orsay, Paris.
Jacques-Henri Lartigue, "Car Trip, Papa at 80 kilometers an hour," 1913.
Lartigue, "The ZYX 24 takes off, Rouzat," 1910.
Edvard Munch, "The Scream," 1893 (Nasjonalgalleriet, Oslo).
Pablo Picasso, "Les Demoiselles d'Avignon," 1907. Museum of Modern Art, New York
British Troops in the Trenches of the Somme, preparing to go over the top, July 1, 1916.
Women Munition Workers, British WWI poster.
(From http://www.iwm.org.uk).

Dimitry Moor, 1919. Soldier, farmer and worker stand together. Text at top: "Proletarians of all countries, unite!"
(From http://www.iisg.nl/exhibitions).
S. Mirzoyan and A. Ivanov, 1929. "Help build the gigantic factories." Poster advertises a state loan for industrial development.
(From http://www.iisg.nl/exhibitions).
Salvador Dali.
The Soviet Pavilion at the 1937 World's Fair in Paris. At the top, the worker and the peasant woman. Not pictured here, the pavilion of Nazi Germany, facing the Soviet Pavilion just across the river.
The CNT and the AIT, the anarchist-syndicalist trade union and the the international anarchist organization, join together to battle fascism.
"The 'Military' Practice of the Rebels." Popular Front propaganda aimed at western governments. On this question, see Guernica.
"Peasants, the land is yours!" From the revolutionary (but anti-Stalinist) communist party, the P.O.U.M.
(From "The Visual Front: Posters of the Spanish Civil War," at UCSD, http://orpheus.ucsd.edu/speccoll/visfront/)
Josef Koudelka, Czechoslovakia, 1968.