This insightful book analyzes the evolution of the operational tasks and cooperation of the European Border and Coast Guard Agency (FRONTEX), the European Asylum Support Office (EASO) and the European Union Agency for Law Enforcement Cooperation (EUROPOL). Exploring the recent expansion of the legal mandates of these decentralized EU agencies and the activities they undertake in practice, David Fernandez-Rojo offers a critical assessment of the EU migration agencies. The book identifies two key trends in the administration of the European Area of Freedom, Security and Justice. Fernandez-Rojo discusses how on one hand the new legal frameworks of FRONTEX, EASO and EUROPOL stress that their operational roles are limited to providing national authorities with technical assistance, while on the other hand these agencies are increasingly involved in guaranteeing the enforcement of EU migration, asylum and border management measures. The book expertly illustrates how FRONTEX, EASO and EUROPOL establish an effective and uniform national implementation of laws and policies, with a focus on their multilateral cooperation in the hotspots established in the aftermath of the refugee crisis. Examining the de jure and de facto operational powers and cooperation of EU migration agencies, this book will be critical reading for academics and students of law, international relations and political science. Its assessment of the effectiveness of policy implementation will also be beneficial for legal practitioners, policy makers and NGOs.