Bloomberg reports:

In May 2008, a unit of Koch Industries Inc., one of the world’s largest privately held companies, sent Ludmila Egorova-Farines, its newly hired compliance officer and ethics manager, to investigate the management of a subsidiary in Arles in southern France. In less than a week, she discovered that the company had paid bribes to win contracts.

“I uncovered the practices within a few days,” Egorova- Farines says. “They were not hidden at all.”

She immediately notified her supervisors in the U.S. A week later, Wichita, Kansas-based Koch Industries dispatched an investigative team to look into her findings, Bloomberg Markets magazine reports in its November issue.

By September of that year, the researchers had found evidence of improper payments to secure contracts in six countries dating back to 2002, authorized by the business director of the company’s Koch-Glitsch affiliate in France.

“Those activities constitute violations of criminal law,” Koch Industries wrote in a Dec. 8, 2008, letter giving details of its findings. The letter was made public in a civil court ruling in France in September 2010; the document has never before been reported by the media.

Egorova-Farines wasn’t rewarded for bringing the illicit payments to the company’s attention. Her superiors removed her from the inquiry in August 2008 and fired her in June 2009, calling her incompetent, even after Koch’s investigators substantiated her findings. She sued Koch-Glitsch in France for wrongful termination.

Koch-Glitsch is part of a global empire run by billionaire brothers Charles and David Koch, who have taken a small oil company they inherited from their father, Fred, after his death in 1967, and built it into a chemical, textile, trading and refining conglomerate spanning more than 50 countries.

Koch Industries is obsessed with secrecy, to the point that it discloses only an approximation of its annual revenue — $100 billion a year — and says nothing about its profits.