* [https://www.hsgac.senate.gov/imo/media/doc/REPORT%20-%20IRS%20&%20TIGTA%20Mgmt%20Failures%20Related%20to%20501(c)(4)%20(Sept%205%202014,%209-9-14%20update).pdf IRS AND TIGTA MANAGEMENT FAILURES RELATED TO 501(c)(4) APPLICANTS ENGAGED IN CAMPAIGN ACTIVITY], Full Report, '''PDF'''