Activities of intelligence agencies have recently moved into the focus of public critical review all over Europe. The publication of the Snowden documents revealed a surveillance practice of unimagined scope. Intelligence surveillance no longer focuses on state organisations or political decision-makers; technical innovation now allows mass surveillance of individual communication. In view of this development, the media and politicians have demanded legal limitations of such practices. This handbook takes into account the various facets of intelligence activities in Europe spanning from chapters on intelligence operations to intelligence cooperation within different policies in Europe, within the EU and without (eg NATO). This book is suitable for academic and practical purposes alike. Political, social and historical analyses are brought into context with the legal discourse.