Immigrants are no longer people in need of protection, or a potential source of labour; they have been turned into to rule-breakers and criminal offenders, or what can be termed “crimmigrant others”. According to several observers, the spheres of immigration control and crime control have traditionally been quite distinct. The subject of immigrant criminality demands critical examination of the law and its definitional powers. The mechanisms used to control the crimmigrant other thus reveal a great deal, not only about the deep divisions between the global North and South, but also about the fault lines which run across Europe. Giorgio Agamben’s figure of the “homo sacer” has long been a point of reference for those trying to capture the condition of migrants’ social marginality and exclusion from the sovereign state’s sphere of biopolitical protection. The chapter also presents an overview of the key concepts discussed in this book.