U.S. Gave Secrets To Terror Suspect
Federal prosecutors mistakenly turned over 48 classified FBI reports to Zacarias Moussaoui in what Judge Leonie M Brinkema describes as grave security breach; reports were summaries of interviews related to Moussaoui's case and bureau's larger investigation of Al Qaeda terror network; they were retrieved in searches of his jail cell this summer on order of judge after she determined that 'significant national security interests' of US could be at risk; federal prosecutors acknowledge that it was 'dangerous' for summaries to be in possession of Moussaoui, only person charged in American court in Sept 11 terror attacks; mishandling of documents is revealed by Judge Brinkema at request of court appointed lawyers acting on Moussaoui's behalf and over protests of prosecutors, who have not revealed how mistakes were made; Justice Dept officials say matter is subject of internal investigation by FBI (M)