In combining the micropolitics approach in international management, the industrial relations literature and business ethics, this article conceptualizes global framework agreements as an alliance between central CSR managers of transnational corporations and central actors within trade unions to monitor subsidiaries in the implementation of CSR policies. The empirical investigation, based on the qualitative analysis of 10 French multinational companies, confirms the relevance of such a conceptualization. It particularly shows that central CSR managers hope mobilizing the union network to increase their capacity to supervise subsidiaries. Over there, it helps understanding concrete mechanisms adopted to implement global framework agreements since, in some of the studied cases, the managerial and union channels are coordinated precisely to strengthen this capacity. It, then, highlights the procedural nature of policies regarding global framework agreements. Overall, this paper examines the conditions necessary for mobilization of the union network and suggests avenues for future research.