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."""" | The Green Wall by D J Vodicka, Hardcover | Indigo Chapters