Prevailing scholarship on migration tends to present migrants as the objects of history, subjected to abstract global forces or to concrete forms of regulation imposed by state and supra state organizations. In this volume, by contrast, the focus is on migrants as the subjects of history who not only react but also act to engage with and transform their worlds. Using ethnographic examples from Africa, Asia, Europe, North America and the Middle East, contributors question how and why particular forms of political struggle and collective action may, or indeed may not, be carried forward in the context of geographic and social border crossings. In doing so, they bring the dynamic relationship between class, gender, and culture to the forefront in each distinctive migration setting.