Matz v. Household Int'l Tax Reduction Inv. Plan

Federal Rule of Civil Procedure 23(f) gives federal courts of appeals authority to permit interlocutory appeals from orders granting or denying motions to certify a class. The rule leaves it murky, however, whether an order partially decertifying a class is appealable under Rule 23(f). In a brief opinion by Judge Posner, the Seventh Circuit has