 Security threat groups are at the heart of many of the altercations that take place within prison walls and they remorselessly commit these vicious acts simply because they are ordered to do so.Inmates often feel animosity and a sense of hatred towards prison guards due to the treatment they receive and the power the guards have over them.In 1999, more than 2,400 correctional officers required medical attention after being assaulted by an inmate, and according to a 2002-2003 study, most guards were assaulted through the use of clubs.