Why are borders so central to our political, moral and affective life? Examining legal theory, novels and films of 20th- century migrations alongside poetry and forensic reports of recent border-crossings, this course traces how mobile subjects - from stowaways to pirates and anticolonial militants - have driven the formation of new ethics, political geographies and radical futures. We will situate borders in relation to practices of policing the colonies, the plantation, the factory and, finally, we will ask: why did we stop relating to migrants as political subjects and begin treating them as the moral beneficiaries of humanitarianism?