Arkansas’ state Legislature is looking into a $4.1 million fee that Labaton Sucharow paid to a Texas-based lawyer who helped the plaintiffs firm attract an Arkansas public pension fund as a client in securities class actions, according to court documents made public on Wednesday.

The existence of a legislative investigation in Arkansas was referenced in a letter to U.S. District Judge Mark Wolf in Boston from a lawyer representing Gerald Rosen—a retired federal judge who, as a special master, has been reviewing a $75 million attorney fee awarded to Labaton Sucharow and other firms after they secured a $300 million securities class action settlement with State Street Corp.