There’s a common cause that bonds the black United States attorney with the black criminal.” These words, according to Department of Justice whistleblower J. Christian Adams, were uttered by none other than Attorney General Eric Holder. And now another former government official is blowing the whistle — and blowing off some righteous steam — in Holder’s direction. He is ex-FBI Special Agent K. Dee McCown, currently director of Global Security and Loss Prevention at W.W. Grainger, Inc. He has written a damning open letter to the attorney general, confirmed as authentic by Snopes. It’s a long missive, but worth the...