The green wall : a prison guard's struggle to expose the code of silence in the largest prison system in the United States

The career of Donald "D.J." Vodicka encompassed the rapid expansion of the prison system. For sixteen years, he was a prison guard in California's highest security prisons, serving meals to gang leaders, serial killers in lockdown cells, and patrolling exercise yards filled with violent felons while unarmed and outnumbered 1000-to-2. He belonged to an elite unit called the Investigative Services Unit (Internal Affairs), responsible for solving horrific crimes inside the walls. He was a decorated veteran officer. He became the largest "whistle-blower" to uncover a group of rogue prison guards who called themselves "The Green Wall."