508 U.S. 49 508 U.S. 49 113 S.Ct. 1920 123 L.Ed.2d 611 PROFESSIONAL REAL ESTATE INVESTORS, INC., et al., Petitionersv.COLUMBIA PICTURES INDUSTRIES, INC., et al. No. 91-1043. Argued Nov. 2, 1992. Decided May 3, 1993. Syllabus * Although those who petition government for redress are generally immune from antitrust liability, Eastern R. Presidents Conference v. […]