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The article questions the overall Cold War discourse by studying the circulation of knowledge and experts between both blocs. For this purpose, International Organizations (International Labor Organization and European commission for Europe by the United Nations) are used as laboratories and transnational social venues where Cold War discourses are produced but in the meantime where exchanges between both blocs are made possible and even encouraged. These exchanges are grounded in continuing relations between expert networks which have consolidated in the inter war period. But they also emerge from the necessity of facing common questions first in the period of reconstruction and then in a time of modernization.