SO IS THE IRS JUST ROTTEN ALL THE WAY THROUGH? Whistleblowers: IRS Officials Behind ‘Fraudulent’ Multi-Billion Dollar Corporate Tax Giveaways. “In a letter to Treasury Secretary Jacob Lew, IRS commissioner John A. Koskinen, and IRS chief counsel William Wilkins, Jane J. Kim, an attorney in the IRS Office of the Chief Counsel in New York, accused IRS executives of “deliberately” facilitating multi-billion dollar tax giveaways. The letter, dated October 19, will add further pressure on the agency, which is under fire for allegedly targeting conservative and Tea Party groups.”