Western societies are immersed in debates about immigration and  illegality. This book examines these processes and outlines how the figure of the "crimmigrant other" has emerged not only as a central object of media and political discourse, but also as a distinct penal subject connecting migration and the logic of criminalization and insecurity. Illegality defines not only a quality of certain acts, but becomes an existential condition, which shapes the daily lives of large groups within the society. Drawing on rich empirical material from national and international contexts, Katja Franko outlines the social production of the crimmigrant other as a multi-layered phenomenon that is deeply rooted in the intricate connections between law, scientific knowledge, bureaucratic practices, politics and popular discourse.