Despite the frequency with which the word 'solidarity' is invoked the concept itself has rarely been subjected to close scrutiny. In this original and stereotype-busting work, David Featherstone helps redress this imbalance through an innovative combination of archival research, activist testimonies and first-hand involvement with political movements. Presenting a variety of case studies, from anti-slavery and anti-fascist organizing to climate change activism and the boycotts of Coca-Cola, Featherstone unearths international forms of solidarity that are all too often marginalized by nation-centred histories of the left and social movements. Timely and wide-ranging, this is a fascinating investigation of an increasingly vital subject.