Maryville Academy was served with a sweeping federal grand jury subpoena Friday seeking financial, medical and personnel records, as state child welfare officials declared the Des Plaines campus unsafe and said they would soon empty it of state wards.

The subpoena, which Maryville’s program and clinical manager James Guidi described as “huge,” orders the state’s largest and most storied home for troubled youths to turn over by Oct. 3 hard copies and computer files for a wide range of documents dating to 1998. The documents include scores of child-welfare case reports and financial records related to Medicaid funding.