Army of God
Army of God (AOG) is a Christian anti-abortion terrorist organization that sanctions the use of force to combat abortion in the United States. HBO produced a documentary on the Army Of God entitled Soldiers In The Army Of God. Clayton Waagner's fake anthrax letters have resulted in their being mentioned among terrorist organizations at the FBI.  The earliest documented incidence of the Army of God being involved with anti-abortion activity occurred in 1982, when three men associated with the organization held an abortion doctor and his wife hostage. The hostages were later released unharmed. 
AOG supports the Second Defensive Action Statement, as produced by the Defenders of the Defenders of Life, which reads:
• We the undersigned, declare the justice of taking all Godly action necessary, including the use of force, to defend innocent human life (born and unborn). We proclaim that whatever force is legitimate to defend the life of a born child is legitimate to defend the life of an unborn child.• We declare and affirm that if in fact Paul Hill did kill or wound abortionist John Britton, and accomplices James Barrett and Mrs. Barrett, his actions are morally justified if they were necessary for the purpose of defending innocent human life. Under these conditions, Paul Hill should be acquitted of all charges against him.
Hill was head of a precursor organization called Defensive Action, which issued signed statements to members of Congress in the early 1990s expressing similar sentiments about "killing the killers".The Army of God promoted the annual White Rose Banquet in Washington D.C. for supporters of the Defensive Action Statement from 1991 through at least 2003.
Ironically enough, the group shares its name with Ansar Allah (Army of God) in Yemen, a Shia militant/ideological movement for a new government there.
- Official website (Note this has some distasteful images of aborted fetuses right at the top)