Never before had Daniel Bergner seen a spectacle as bizarre as the one he had come to watch that Sunday in October. Murderers, rapists, and armed robbers were competing in the annual rodeo at Angola, the grim maximum-security penitentiary in Louisiana. The convicts, sentenced to life without parole, were thrown, trampled, and gored by bucking bulls and broncos before thousands of cheering spectators. But amid the brutality of this gladiatorial spectacle...