“You have taken our civil rights—we want our human rights.” On April 14, 1971, a handful of prisoners attacked the guards at Kingston Penitentiary and seized control, making headlines around the world. For four intense days, the prisoners held the guards hostage while their leaders negotiated with a citizens’ committee of journalists and lawyers, drawing attention to the dehumanizing realities of their incarceration, including overcrowding, harsh punishment and extreme isolation. But when...