507 U.S. 380 507 U.S. 380 113 S.Ct. 1489 123 L.Ed.2d 74 PIONEER INVESTMENT SERVICES COMPANY, Petitionerv.BRUNSWICK ASSOCIATES LIMITED PARTNERSHIP et al. No. 91-1695. Argued Nov. 30, 1992. Decided March 24, 1993. Syllabus * As unsecured creditors of petitioner—a company seeking relief under Chapter 11 of the Bankruptcy Code—respondents were required to file proofs of […]