A former state legislator pleaded guilty Monday to immigration fraud for his role in a scheme to allow Russian nationals to stay in this country illegally, including arranging a sham wedding. Adam Mack, 39, of Portland, faces up to 10 years in federal prison and a $250,000 fine on two charges of aiding and abetting visa fraud and up to five years and a $250,000 on three charges of aiding and abetting marriage fraud, according to U.S.