Magnum Photos -
SPAIN. Barcelona. August 1936. Republican soldiers leaving for the Aragon front. The sentence written on the train means "UHP" (Union of Proletariat Brothers) swears upon these fraternal letters that you will sooner dye than live under tyranny." 
Image Reference 
BOB1936001W000X1/ICP126 
(PAR75398) 
© Robert Capa / International Center of Photography/Magnum Photos 
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