International migrants’ home countries often play an integral part in protecting their citizens’ labor and human rights abroad. At the same time, institutions such as labor unions, worker centers, and legal aid groups are among the most visible actors holding governments of immigrant destinations accountable. Focusing on Mexico and the United States, Scaling Migrant Worker Rights analyzes how these organizations pressure governments to defend migrants. The result is a multilayered picture of the impediments to migrant worker rights and the possibilities for their realization.