In recent years, the deportation and detention of immigrants has become a common phenomenon around the world. In this article, we shed light on the global expansion of crimmigration (the increasingly blurring of lines between immigration and criminal laws) and examine in depth the United States as an example of this trend. Crimmigration scholarship has largely focused on the processes in which laws, media narratives, and political discourses criminalize undocumented immigrants. We summarize the literature that demonstrates how these processes are predicated on the racialization and gendering of certain immigrants, in the United States and elsewhere. Using the US case as an example, we discuss how criminalization practices are closely tied to for profit prison interests. Finally, we provide suggestions for future research to critically examine the criminalization of immigration and immigrants.