You've heard about Nigerian scammers. So has AT&T, the U.S. Justice Department said this week. The Justice Department accused AT&T of receiving more than $16 million for providing a calling service for the deaf when AT&T knew that it was being used by the Nigerian swindlers. The government made the accusations Wednesday as part of a whistle-blower lawsuit in Pittsburgh's federal court. Prosecutors say AT&T could be in violation of the False Claims Act.