This study presents data about State prison inmates: their background and families, criminal histories, gang membership, drug and alcohol use, HIV/AIDS infection, gun use and possession, sentence, time served, and participation in prison programs. The report also presents data on the victims of violent inmates. Compiled from in depth interviews with a nationally representative sample of almost 14,000 State prisoners in 277 facilities in 45 States, this is the most comprehensive study to date of State prison inmate characteristics.