The Guardian and BBC have made a documentary outlined in this story, Revealed: Pentagon's link to Iraqi torture centres.
It seems that James Steele, the engineer and trainer of the paramilitary forces in El Salvador, was picked by Donald Rumsfeld to go to Iraq. There, he founded US-funded sectarian special police commandos and a network of torture centers.
They present considerable evidence that Petraeus, Rumsfeld and Bush were well aware of what was going on.
No US outlets have picked up the news. Go figure.
To watch the 51 minute documentary or its 5 minute summary, go here.