The F.B.I. has failed to aggressively investigate accusations of espionage against a translator at the bureau and fired the translator's co-worker in large part for bringing the accusations, the Justice Department's inspector general concluded. In a long-awaited report that the Justice Department sought for months to keep classified, the inspector general issued a sharp rebuke to the F.B.I. over its handling of claims of espionage and ineptitude made by Sibel Edmonds, a bureau translator who was fired in 2002 after superiors deemed her conduct disruptive." The report [came] from the office of Glenn A. Fine, the Justice Department's inspector general. Mr. Fine's investigation found that many of Ms. Edmonds's accusations "were supported, that the F.B.I. did not take them seriously enough and that her allegations were, in fact, the most significant factor in the F.B.I.'s decision to terminate her services." Ms. Edmonds's case has become a cause clbre for critics who accused the bureau of retaliating against her and other whistle-blowers who have sought to expose management problems related to the campaign against terrorism. The American Civil Liberties Union joined her cause earlier this week, asking an appellate court to reinstate a whistle-blower lawsuit she brought against the government. The suit was dismissed last year after Attorney General John Ashcroft, invoking a rarely used power, declared her case to be a matter of "state secret" privilege, and the Justice Department retroactively classified a 2002 Congressional briefing about it.