From the 19 November 2003 edition of the Wall Street Journal, in an article by Matthew Kaminski:

... In this Byzantine world, the military must be as innovative as its enemies. The Fourth ID fakes faids to throw off adversaries. "We don't get sidetracked by tribal feuds any more," said LtCol Ted Martin.

The division's analysts headquartered at Saddam's Tikrit palace use "link analysis" to figure who's tied to whom in the Sunni triangle, borrowing a technique honed by the FBI to fight organized crime in the US. The 'insurgents' resemble Mafia organizations, in structure and methods, more than they do a military or guerilla force.