The question of migration has come to dominate the news agenda in many countries, but what does the word 'migrant' really mean today and how should we respond to those who are labelled 'migrants'?In this short book Alain Badiou argues that our way of thinking about migration should be governed both by an ethical duty to welcome the migrant in the name of hospitality and also by the urgent need to put an end to the global capitalist oligarchy that has produced the migrant as a figure of contemporary crisis. For the 'migrant,' argues Badiou, is in fact a nomadic proletarian. Today, our homeland is the world, and any meaningful politics must include those who come to us and who represent the universal nomadic proletariat.Writing with the rigor, clarity, and polemical flair that have made him one of the world's most influential philosophers, and drawing on a rich body of material including contemporary poetry and the words of an anonymous migrant, Badiou develops a powerful riposte to those who have stoked the fear of migrants and exploited the migration question for political ends.