[Workers listening to a comrade speaking outside at night during the strike, Paris]

[Workers having lunch at a large table during the strike, Paris]

[Republican soldier firing gun through peephole, University City, Madrid]

[Republican soldiers reading papers, Madrid]

[Militiamen eating lunch, University City, Madrid]

[Leon Trotsky lecturing, Copenhagen, Denmark]

[Leon Trotsky lecturing, Copenhagen, Denmark]

[Republican soldier aiming rifle through a wall, University City, Madrid]