James Kilgore, social justice activist (who served six years in prison), adjunct lecturer at the University of Illinois Urbana-Champaign in global studies, and the author of Understanding Mass Incarceration: A People's Guide to the Key Civil Rights Struggle of Our Time (The New Press, 2015), offers his "field guide" to mass incarceration, explaining the fundamental debates over rehabilitation vs punishment, privatization, 3-strikes, and more.