This poster is from the Spanish Communist Party. You can see in the bottom left-hand corner of the poster "Sector Sur" (Southern Sector) and as well as "Secretaria de Agit-Prop." Agit-Prop was a contemporary art movement that focused on politics and revolutions, and was very prominent in the Russian Revolution and the Spanish Civil War. As the Republican army mobilized an increasing number of men, male industry workers had to be replaced by women. This poster was meant to mobilize women in the southern sector of Madrid to help with factory work.

Source: Communist propaganda poster recruiting women industrial workers. La Cucaracha: The Spanish Civil War, 1936-1939. http://lacucaracha.info/scw/diary/1938/december/

 

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Translation: “The women want to win the war, too. We should help them.”