From the streets of Calais to the borders of Melilla, Evros and the United States, the slogan 'No borders!' is a thread connecting a multitude of different struggles for the freedom to move and to stay. But what does it mean to make this slogan a reality? Drawing on the author's extensive research in Greece and Calais, as well as a decade campaigning for migrant rights, Natasha King explores the different forms of activism that have emerged in the struggle against border controls, and the dilemmas these activists face in translating their principles into practice. Wide-ranging and interdisciplinary, No Borders constitutes vital reading for anyone interested in how we make radical alternatives to the state a genuine possibility for our times, and raises crucial questions on the nature of resistance.