Is the hammer coming down on San Diego City Hall? A flurry of federal grand jury activity suggests it will be, with more than a half-dozen demands since New Year's Day for documents on pension-system underfunding, labor contracts, reports to Wall Street credit-rating agencies and e-mail messages of a former top aide to Mayor Dick Murphy. The FBI and U.S. Attorney's Office are investigating possible financial crimes related to the city's underfunding of the pension system, and errors and omissions in city financial statements. Both agencies also are conducting a separate public-corruption probe. These criminal investigations aren't the only dark...