The Mexican Cristero experience constituted a political laboratory and a school of resistance providing blueprints of action later exercised in Spain. With barely ten years between their own countries’ conflicts, the ladies of Catholic Action—in Mexico and then in Spain—organized themselves, first, as a passive resistance, and then both used the same justifications to support the use of political violence. News of the Mexican Catholic women’s experience had arrived across the Atlantic in the chronicles of Spanish newspapers beginning in the late 1920s and in the edifying, right-leaning novels that were spread, above all, in Spanish Catholic schools during the 1930s. This helps us understand the parallels between the actions, liaisons, informants, and weapons suppliers of the Brigades and other Catholic organizations in Mexico and the members of the women’s fifth column in Spain. Perhaps the contemporary presence in the public sphere of European fascists resonated more among young urban Madrid or Barcelona women during the Spanish Civil War, but, without a doubt, the social origin, experience, and cultural heritage of Mexican women was more in line with the efforts of conservative Spanish women all over the country during the conflict. In both cases, the defence of religion and their Catholic identity was at the forefront of their efforts and gave coherence to what might, at times, appear to be diverse political projects.