Who gets blamed for AIG?

Who gets blamed for the failure of AIG (AIG)? How far back does the responsibility go? One year? Five? Ten?

Is Sandy Weill to blame for Citigroup's (C) downfall? He created the company. Maybe it was so big that it could not be properly managed at the start. Maybe Sandy should be blamed. He also picked Chuck Prince to be CEO. What a disaster that was.