Jonathan and Diana Toebbe pleaded guilty for a second time on Tuesday to federal charges that they tried to sell secrets about U.S. submarine nuclear propulsion systems to a foreign country. The couple originally pleaded guilty in February but a judge threw out the plea agreements last month after deciding the sentences called for were too low. At the time of his plea, Toebbe conceded he sent a package to a foreign government, listing a return address in Pittsburgh that contained a sample of restricted data and instructions for establishing relationship to buy additional restricted data. Toebbe said he began...