The Ambivalences of Labor on the Horizon of the Cognitive Capitalism - The article considers the main theories of the transformations of the paradigms of labor and production of value of the last decades, that are often summarized as the passage from Fordism to Post-Fordism. Particularly, illustrating the various articles of this volume, it focuses the hypothesis of the cognitive capitalism, analyzing the centrality of the networks and the production of knowledge in the processes of capitalistic accumulation, the global governance, and the new scenarios of conflict.