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At New Mexico's Empire Zinc mine, Mexican-American workers protest the unsafe work conditions and unequal wages compared to their Anglo counterparts. Ramon Quintero (Juan Chacon) helps organize the strike, but he is shown to be a hypocrite by treating his pregnant wife, Esperanza (Rosaura Revueltas), with a similar unfairness. When an injunction stops the men from protesting, however, the gender roles are reversed, and women find themselves on the picket lines while the men stay at home. Wikipedia