Alden Global Capital, a prominent hedge fund that controls more than 100 newspapers, moved nearly $250 million of employee pension savings into its own accounts in recent years, an unusual move that is now triggering federal scrutiny. The hedge fund, which is the controlling owner of such newspapers as the Denver Post and Boston Herald under the brand MediaNews Group, in some cases moved 90 percent of retirees' savings into two funds it controlled, according to public records filed with the Labor Department. Most of the money has now been moved back out of the hedge funds.