We all know that orange is the new black and mass incarceration is the new Jim Crow, but how much do we actually know about the structure, goals and impact of our criminal justice system? Understanding Mass Incarceration offers the first comprehensive overview of the incarceration apparatus put in place by the world's largest jailer: the USA. Drawing on a growing body of academic and professional work, Understanding Mass Incarceration describes in plain English the many competing theories of criminal justice.