Excuse me for being late on this thread and saying so but wasn't this exactly what John Ascroft testified to the commission? The Chinese wall prevented communication on the terrorists and one Jamie Gorelick (pronounced GORE-LICK or, alternatively: Clinton knee-pads) was the left wing culprit trying to protect Clintoon's China activity and fund raising.
Yeppers...and Ashcroft got excoriated for bringing it up in his testimony, IIRC.
But now we see the fruits of Gorelick's labors. It prevented information about Atta, al-Shehhi, and two others from being shared between Defense and Justice.