The Davis's allege that Blackwater exercised little oversight of the billions in government contracts it has won over the last decade.
The lawsuit also claims that Melan Davis, who handled accounts for Blackwater's contracts with FEMA and the Department of Homeland Security, approached her supervisors with concerns about the company's book-keeping. But she was told to "back off," and that she "would never win a medal for saving the government money."
Davis was ultimately fired by Blackwater, now known as Xe. She claims the firing was illegal.
Xe did not respond to the Times's request for comment.
The lawsuit was filed under the False Claims Act in December 2008. But the key documents were only made public recently, after the Justice Department declined to join the case.
The charges are only the latest controversy associated with Blackwater/Xe, which last month saw two of its former contractors charged with murder for the shooting deaths of two Afghan men. Still, the company appears to be expanding its presence in Afghanistan.