There are new allegations that heavily armed private security contractors in Iraq are brutalizing Iraqi civilians. In an exclusive interview, four former security contractors told NBC News that they watched as innocent Iraqi civilians were fired upon, and one crushed by a truck. The contractors worked for an American company paid by U.S. taxpayers. The Army is looking into the allegations. The four men are all retired military veterans: Capt. Bill Craun, Army Rangers; Sgt. Jim Errante, military police; Cpl. Ernest Colling, U.S. Army; and Will Hough, U.S. Marines. All went to Iraq months ago as private security contractors. "I...