Former AIG CEO Sues US Government for at Least $25 Billion

In its complaint, Greenberg's Starr International said that in bailing out AIG and taking a nearly 80 percent stake, the government failed to compensate existing shareholders. It said this violated the Fifth Amendment, which bars the taking of private property for public use without just compensation.

"The government's actions were ostensibly designed to protect the United States economy and rescue the country's financial system," Starr said. "Although this might be a laudable goal, as a matter of basic law, the ends could not and did not justify the unlawful means employed."