Book excerpt: Introduction : Britain's empire of camps -- Concentrating the "dangerous classes" : the cultural and material foundations of British camps -- "Barbed wire deterrents" : detention and relief at Indian famine campus, 1876-1901 -- "A source of horror and dread" : plague camps in Indian and South Africa, 1896-1901 -- Concentrated humanity : the management and anatomy of colonial campus, c. 1900 -- Camps in a time of war : civilian concentration in southern Africa, 1900-1901 -- "Only matched in times of famine and plague" : life and death in the concentration camps -- "A system steadily perfected" : camp reform and the "new geniuses from India", 1901-1903 -- Epilogue : Camps go global : lessons, legacies, and forgotten solidarities