Three young men who pleaded guilty in an unsuccessful plot to bomb the state Route 82 bridge received harsh prison sentences Tuesday in federal court in Akron. But U.S. District Judge David D. Dowd Jr. told a team of government prosecutors, in no uncertain terms, that he did not intend to follow their recommendations for much stiffer sentences — 30 years in one instance. One by one, after Dowd had listened to arguments from both sides in an emotionally charged hearing that lasted 3½ hours, the defendants received the following federal prison terms: • Alleged ringleader Douglas L.