From Chris Whalen, writing at Barry Ritholtz's Big Picture blog ...

The key point is that neither the public, the Fed nor the Treasury seem to understand is that the CDS contracts written by AIG with these various non-insurers around the world were shams - with no correlation between "fees" paid and the risk assumed. These were not valid contracts as Fed Chairman Ben Bernanke, Treasury Secretary Geithner and Economic policy guru Larry Summers claim, but rather acts of criminal fraud meant to manipulate the capital positions and earnings of financial companies around the world.

Indeed, our sources as well as press reports suggest that the CDS contracts written by AIG may have included side letters, often in the form of emails rather than formal letters, that essentially violated the ISDA agreements and show that the true, economic reality of these contracts was fraud plain and simple. Unfortunately, by not moving to seize AIG immediately last year when the scandal broke, the Fed and Treasury may have given the AIG managers time to destroy much of the evidence of criminal wrongdoing.