From this article in New York Times :
"But Mr. Johnson found a way to recover the federal royalties on his own. In 1995, he filed suit under the False Claims Act, a longstanding law intended to encourage whistle-blowers. Under the act, best known for its use against overbilling by military contractors, a private citizen can sue a company, contending that it defrauded the federal government. Companies found guilty have to pay as much as three times the amount of their fraudulent gains, and any person who files a suit is entitled to keep up to 30 percent of the money recovered."
Now Bobby Maxwell whose job has been terminated by the Interior Dept (USA) has filed a suit against Kerr-McGee corporation. If he wins, US Govt., Mr.Maxwell and his lawyers will all make a lot of money just as Mr. Johnson did. It seems to be one way to fight corruption and make money at the same time. I wonder how many other countries have similar Acts.