http://www.prwatch.org/news/2016/02/13039/irs-gives-grants-karl-roves-dark-money-group-social-welfare-certification
"The IRS has granted nonprofit status to Karl Rove's dark money political operation, Crossroads GPS, which for the past five years has pushed the legal envelope in order to influence elections but keep its donors secret. Formed in the wake of Citizens United, Crossroads GPS has been one of the biggest secretly-funded political players, raising and spending $330 million on election-related ads attacking Democratic candidates or praising Republicans, but without doing anything that might be described as advancing "social welfare." Although the majority opinion in the U.S. Supreme Court's Citizens United decision endorsed disclosure of donors, in the five years following the decision, spending by secretly-funded 501(c)(4) nonprofits has exploded."
