SCRANTON - A federal grand jury has indicted longtime State Sen. Raphael J. Musto, the latest legislator to be caught up in an overlapping series of corruption investigations. The indictment announced Tuesday alleges that Musto (D., Luzerne), 81, accepted bribes, gifts, and construction work from an unnamed contractor in return for his help in obtaining state grants and loans. Known as "Ray," Musto, who is to retire next week after 38 years in the General Assembly, has been a political fixture in the state's northeastern region since 1972, when he succeeded his father to a seat in the state House.