For the first time, the extent to which some private contractors have profited from the conflict and rebuilding has been researched by the BBC's Panorama using US and Iraqi government sources.
"It may...be the largest war profiteering in history."
A US gagging order is preventing discussion of the allegations.
The order applies to 70 court cases against some of the top US companies.
While George Bush remains in the White House, it is unlikely the gagging orders will be lifted.
To date, no major US contractor faces trial for fraud or mismanagement in Iraq.
Iraq Loses $Billions in U.S. Taxpayer Funds
Billions $ Lost In Iraq
Ex-White House Aide McClellan: Bush Lied About Iraq!
Iraq War Cost Update: 3,501 U.S. Soldiers Killed; up to 71,042 Iraqi Civilians killed; and $432.5 Billion Spent