This is an excellent publication containing a wealth of information about problems associated with gangs and security threat groups (STGs) in American jails and prisons. Sections of this report include: introduction; prior research; definitions; methodology; characteristics of the responding correctional facilities; scope and extent of the gang/STG problem in American corrections; the issue of gang recruitment behind bars; the issues and controversies about religious worship for inmates and prisoners; the issue of racial extremism and racial conflict behind bars; the issue of gang renunciation-getting out of the gang behind bars; housing gang inmates separate or together-which is best; the politics of gang/STG problems in American corrections; gang/STG abuse of mail and telephone communications in American corrections; other types of problems behind bars caused by gangs/STGs; strategies to control gangs/STG’s behind bars; what should be done to respond to the gang/STG problem; and summary and conclusions.