The Times of London has a very good account of what took down AIG, and it predates Joseph Cassano, the head of its Financial Products Unit, and it makes it clear that the insurance giant was on shaky ground, with the active participation of its founder Hank Greenberg, for at least a decade previous.
It also notes how Brooksley Born, who was purged by Fed Chairman Alan “Bubbles” Greenspan and Treasury Secretary Robert “Why am I not Under Indictment for Insider Trading” Rubin, knew about the problem, and that it was systemic, and tried to do something about it.
It’s a good read, and highly recommended.