Who leaked secret grand jury transcripts to the Chronicle about Barry Bonds’ (pictured) alleged steroid use? A month ago, federal prosecutors filed a brief that strongly suggested steroid-maker Victor Conte was the secret source — a claim the Chronicle denied. Now Bonds’ attorney, Michael Rains, says it was prosecutors who leaked the transcripts to the Chronicle, according to the Mercury News. Rains has asked Judge Martin J. Jenkins to investigate the latest leak. A judge will decide Aug. 4 whether Chronicle reporters Mark Fainaru-Wada and Lance Williams should go to jail for refusing to reveal their source of the transcripts.