This chapter explores the transition in the dominant policies and practices that have impelled the momentum in international migration as a defining feature of globalization. It begins with a brief survey of current policy priorities, before considering some dominant theories of migration. The securitization of national borders by many OECD governments has enabled the restriction of rights to migrate and privileged certain groups of migrants over others. Labour migration has come to be privileged over other forms of migration, but often involves temporary work visas and significant vulnerability for migrant workers. The global movement to protect migrants' labour rights has had generally limited impact, but with some notable successes and continued momentum. Ultimately, migration continues to be politically and socially contentious in many parts of the world, adding to the vulnerability of many migrant workers.