Most Federal employees fall under OPM guidelines for relief from duty that cover both job performance causes and to a lesser extent off duty behavior. The protections are extensive and firing an employee, at least from a management point of view, is onerous. Within several Federal agencies there are excepted groups that are not affforded the same "protections" because of what is considered the special nature or sensitivity of their positions. The AFGE, the union that represents TSA agents, has made it a main focus to get screeners, etc., who are now in excepted positions back under the full OPM protective umbrella.