The Chron reports that two of its reporters, Lance Williams (left) and Mark Fainaru-Wada, received subpoenas today (May 5) to testify before the federal grand jury investigating possible perjury charges against Barry Bonds. As the Chron points out, subpoenas are the latest strategy by federal prosecutors to force reporters to give up their confidential sources or go to jail. Judith Miller of the New York Times went to jail last year before eventually naming Vice President Dick Cheney’s chief of staff, Scooter Libby, as her source for the identity of CIA employee Valerie Plame.