[Loyalist soldiers crouching by trees, Cerro Muriano, Spain]

[Two loyalist soldiers leaning on a tree while listening to an officer give a pep talk, Andalusian front, Spain]

[Two Republican soldiers leaning on a tree while listening to a speech, Córdoba front, Spain]

[Republican soldier sleeping on the ground after a three day battle, Cordoba front, Spain]

[Two Republican soldiers eating in a laboratory, University City, Madrid]

[Republican soldier firing riffle from desk, University City, Madrid]

[Republican soldiers eating in classroom, University City, Madrid]

[Laboratory destroyed by bombing, University City, Madrid]

[Republican soldier firing gun from desk, University City, Madrid]

[John F. Kennedy during a cabinet meeting, Washington, D.C.]

[Robert F. Kennedy campaigning for the Senate, Elmira, New York]

[Priests singing, Lisieux, France]

[Contact sheet of images of Leon Trotsky lecturing Danish students on the history of the Russian Revolution, Copenhagen]

[Two woman holding girl's hands in the Luxembourg Garden, Paris]

[Children playing on a street, Paris]

[Man and woman at a May Day celebration, Paris]

[Dancing in the street on the evening of Bastille Day, Paris]

[Jacques Duclos, one of the leaders of the French Communist party, addressing a rally, Paris]

[Maurice Thorez (right), head of the French Communist party, with a man who had been injured in a political demonstration, Paris]

[Crowd in front of political posters the day of the election run-offs that would put into power the leftist-liberal Popular Front coalition government, Saint-Denis, France]

[Man voting in the election run-offs that would put into power the leftist-liberal Popular Front coalition government, Saint-Denis, France]

[Man voting in the election run-offs that would put into power the leftist-liberal Popular Front coalition government, Saint-Denis, France]

[Workers asleep at the Renault factory on the first night of the sit-in strike, Boulogne-Billancourt, France]

[Sit-in strikers at the Lavalette Construction Company plant with a basket of sausages sent by a sympathetic local butcher, Saint-Ouen, France]