A state prosecutor said in open court today that two aides to former Probation Commissioner John J. O’Brien have been given immunity in exchange for information about their former boss, who was indicted on state and federal charges in connection with the rigged hiring and promotion practices at the agency. Edward P. Ryan, O’Brien’s legislative liaison, and Francis M. Wall, a former deputy commissioner, are cooperating with prosecutors, giving them a firsthand view of how O’Brien allegedly doled out probation jobs to politically connected candidates.
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