This collection explores organized crime and terror networks and the points at which they intersect. It analyses the close relationships between these criminalities, the prevalence and ambiguity of this nexus, the technological elements facilitating it, and the financial aspects embedded in this criminal partnership. Organized Crime and Terrorist Networks is the outcome of empirical research, seminars, workshops and interviews carried out by a multinational consortium of researchers within ‘TAKEDOWN’, a Horizon 2020 project funded by the European Commission. The consortium’s objective was to examine the perspectives, requirements and misgivings of front-line practitioners operating in the areas of organized crime and terrorism. The chapters collected in this volume are the outcome of such analytical efforts. The topics addressed include the role of Information and Communication Technology in contemporary criminal organizations, terrorism financing, online transnational criminality, identity crime, the crime-terror nexus and tackling the nexus at supranational level. This book offers a compelling contribution to scholarship on organized crime and terrorism, and considers possible directions for future research. It will be of much interest to students and researchers engaged in studies of criminology, criminal justice, crime control and prevention, organized crime, terrorism, political violence, and cybercrime.