In the law firms K&L Gates LLP added Clifford C. Histed as a partner in its government enforcement practice. Histed practices in securities and derivatives/commodity futures litigation. He had been with the U.S. attorney’s office for the Northern District of Illinois since 2006. He was most recently deputy chief of the securities and commodities fraud section following a tenure in the same role with the financial crimes and special prosecutions section. •Megan G. Riley joined Barack, Ferrazzano …