Winston & Strawn has expanded its white-collar litigation team with the addition of former U.S. Attorney Marc Krickbaum.Krickbaum practices in complex commercial litigation, internal investigations, and white-collar criminal defense. He was most recently the U.S. attorney for the Southern District of Iowa. Before that, he served for nearly a decade as an assistant U.S. attorney in Chicago and in Des Moines, Iowa.In the Southern District of Iowa, Krickbaum oversaw all civil and criminal litigation in the district. He …