From its development in the 1980s, the sanctuary city movement—municipal protection of people with uncertain migration status from national immigration enforcement—has been a powerful and controversial side of progressive migration policy reform. While some migration activists view sanctuary city policy as the most important aspect of their work, others see it as actively impairing efforts in the fight for migrant rights. In Making Sanctuary Cities, Rachel Humphris provides a new understanding of how citizenship is negotiated and contested in sanctuary cities and what political potentials are opened (and closed) by this designation. Through long-term fieldwork across the sanctuary cities of San Francisco, Sheffield, and Toronto—three of the first municipalities to adopt this designation in their respective countries—Humphris investigates the complexity of sanctuary city policy. By capturing the wide-ranging meanings and practices of sanctuary in comparative context, Humphris uncovers how liberal citizenship is undermined by the very thing that makes it worth investing in: the promise of equality. Attending to the tensions inherent in sanctuary policy, this book opens vital questions about the ways governing systems can extinguish political ideals, and how communities choose to live and organize to fight for a better world.