William Johnson and Dixie Johnson, two leaders of Fried, Frank, Harris, Shriver & Jacobson’s white-collar defense and securities enforcement practice, are leaving to join King & Spalding.

William Johnson, 47, a Law Journal columnist based in New York, joined Fried Frank in 2009. He served as a prosecutor at the U.S. Attorney’s Office for the Southern District where he was chief of the Securities and Commodities Fraud Task Force and oversaw the investigation and prosecution of cases including Galleon Group/Raj Rajaratnam, Bernard Madoff, Marc Dreier and Refco. He also served as an attorney at the SEC.