Youth Activism and Solidarity: The Non-Stop Picket Against Apartheid tells the story of a group of young people who actively campaigned against apartheid in 1980s London. From April 1986 until just after Nelson Mandela was released from prison in February 1990, supporters of the City of London Anti-Apartheid Group maintained a continuous protest, day and night, outside the South African Embassy in central London. This book examines how and why a group of children, teenagers and young adults made themselves 'non-stop against apartheid' and created one of the most visible expressions of anti-apartheid solidarity in Britain. Brown and Yaffe offer new insights to the study of social movements and young people's lives, exploring how the practices of growing up are entangled with the practices of young people's activism and building solidarity. The book contextualizes the Non-Stop Picket in relation to the history of apartheid (and resistance to it) in South Africa and anti-apartheid solidarity campaigning in Britain since the 1950s. It considers how the Non-Stop Picket fitted into the changing geographies of young people's lives in London in the 1980s. Drawing on interviews with over ninety former participants in the Non-Stop Picket of the South African Embassy and extensive archival research using previously unstudied documents, this book theorises solidarity and 'growing up' as social practices to provide a theoretically-informed, argument-led analysis of how youthful activists learned to practice solidarity.Youth Activism and Solidarity will be of interest to geographers, historians and a wide range of other social scientists concerned with the historical geography of the international anti-apartheid movement, social movement studies, contemporary British history, and young people's activism and geopolitical agency.