In May, 2010, Kalief Browder, a sixteen-year-old high-school sophomore, was arrested in the Bronx for allegedly stealing a backpack. He insisted that he was innocent, but he was taken to Rikers Island, New York City’s four-hundred-acre jail complex. Browder spent the next three years at Rikers, awaiting trial while his case was repeatedly delayed by the courts. In May, 2013, the case against him was dismissed. (Last fall, I wrote about Browder for the magazine.) This week, The New Yorker obtained two surveillance-camera video clips that depict the dual horrors of Browder’s years in jail: abuse by a guard and by fellow-inmates.