The Washington Post carries this story about the role of the IRS Chief Counsel in the auditing of groups with conservative titles. There are also news reports (like these) suggesting that a recently retired IRS lawyer has implicated the IRS Chief Counsel in the targeting. (I had previously suggested that investigators "follow the lawyers" and had posted about that here, here, and here.) Excerpt from WaPo story:
The chief counsel’s office for the Internal Revenue Service, headed by a political appointee of President Obama, helped develop the agency’s problematic guidelines for reviewing “tea party” cases, according to a top IRS attorney. [P] In interviews with congressional investigators, IRS lawyer Carter Hull said his superiors told him that the chief counsel’s office, led by William Wilkins, would need to review some of the first applications the agency screened for additional scrutiny because of potential political activity.
[edited since posting]