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The union renewal requirement is not something new, but current social alternations and the transformations related to labor relations make it more obvious today. The union develops and mobilizes new resources that enable it to strengthen its mechanisms of action, as well as its position, in an increasingly volatile context. An empirical study of a multinational firm delocalized in Tunisia reveals the method used by the union in call centers to gradually gain access to four sources of power before and after the Tunisian revolution so as to earn more credibility and expand its fields of intervention.