The WaPo reports on the many sub and sub-sub contractors required to perform contracts in "Multiple Layers Of Contractors Drive Up Cost of Katrina Cleanup". One example they present is that of the FEMA buses.
Now, here's what the WaPo isn't telling you. In the article, they refer to "Spanish-speaking crews" doing roofing work. That's the WaPo's euphemism for "federal money is going to those who have an 80% chance of being illegal aliens".
By using multiple layers of subcontractors, prime contractors are able to employ illegal aliens with an even greater deal of impunity than they would if they employed them directly.
The trickle-down contracting is bad enough, but what makes it even worse is that many of the jobs were given to those here illegally rather than to American hurricane victims.
The Washington Post supported illegal aliens taking rebuilding jobs from American hurricane victims, so it's understandable that they would want to avoid discussing this side of things.