The Medill Innocence Project at Northwestern University has been a thorn for Chicago police and prosecutors for more than a decade, helping uncover evidence leading to the release of 11 inmates. So the Cook County state’s attorney office is now fighting back by demanding information on student grades and class courses to determine if student grades are linked to helping get convictions overturned. Northwestern officials are opposing the subpoenas, and a retired federal judge says the move by prosecutors deserves the “Gestapo label.”