The volume contains nine case studies on the recent history of transnational criminal law, having emerged from current international research projects. The papers cover cross-border political crime and security threats, extradition and expulsion, police cooperation and international expert discussions on social crime and torture. The focus is less on event-historical phenomena, but on transnational legal-political interactions of different actors. The contributions thus analyze the historical development of transnational criminal law as a form of temporally, spatially and legally limited criminal law and security regimes. As a result, the volume shows that the investigated transnationalization of criminal law in the 19th and 20th centuries did not lead to a cohesive normative order, thus offering legal-historical interpretations of current problems of international criminal law.