If we think about global migration law, refugee law is the place to start, since this seems to be the area in which the institutions, the norms, the system are the clearest example of a global migration law. Unlike most other migrants, refugees have their own convention and their own agency—the UN High Commissioner for Refugees (UNHCR) dating from 1950—and a set of regional agreements on refugees, and that has produced a solid foundation of rights, seventy years of practice, and billions of dollars a year in assistance, as well as coordinated international action on resettlement and return. I think it is fair to call it a legal regime on refugees.