Thrown out by AIG, Hank Greenberg sues the folks left to mind the store.

Of all the people who are angry at AIG right now, there is one in particular whose anger is at least as great as that of anybody in Congress or the administration but whose voice is one that you haven't heard yet in the uproar over AIG bonuses: Maurice "Hank" Greenberg.

Does the name ring a bell? If it doesn't, that's OK: The first time most people in the country heard of AIG was when it blew up, and given that AIG is (or was) one of the world's most complicated and opaque companies, that's understandable. But for close to 40 years, the AIG name was almost inseparable from Greenberg's. It was Greenberg who built it up from an insurance backwater into an enormous international financial conglomerate. He presided over three decades of its ascent, left under pressure three and a half years before its fall—and is now suing AIG, or what's left of it, for mismanaging the empire he left.

On the surface, the stakes involved in Greenberg's lawsuit filed earlier this month—before the current revelations about AIG's massive bonuses—might seem small. The $70 million in taxes that Greenberg paid on shares AIG gave him that are now worthless sounds like barely a footnote amid the storm of the hundreds of billions of AIG's losses.

The question at stake in Greenberg's suit, however, goes to the heart of what went wrong in American business: Is the current catastrophe the fault of people like Greenberg, who built the edifices that so rapidly came tumbling down, or of the folks left to mind the store just long enough to wreck and pillage it?

Hank Greenberg was one of a generation of charismatic tycoons who built the companies that are now at the center of the current scandal. Now 85 years old, he is of the same cohort as longtime Bear Stearns Chairman Alan "Ace" Greenberg and Citigroup titan Sanford Weill. You can think of these men as the patriarchs. The paths they took to the pinnacle of finance were different—Ace Greenberg spent his whole career at Bear Stearns, rising through the ranks; Hank Greenberg joined AIG as a rising executive and vaulted to the CEO spot in 1968; Weill built Citigroup through a long series of audacious acquisitions—but at the turn of the millennium, each of them led companies so marked by their stamp that it was almost impossible to refer to Bear, Citi, or AIG without in the same sentence mentioning Ace Greenberg, Hank Greenberg, or Sandy Weill.

Of the three, it's Hank Greenberg who was the most controversial. Greenberg resigned as CEO of AIG in 2005, his reputation wrecked by an accounting scandal in which AIG overstated the value of its assets. He was then 79, and there is every indication that he would have held on even longer had he not been forced to quit (possibly, according to Greenberg's lawyer, David Boies, because the New York State attorney's office threatened to bring criminal charges against the company if he did not).