Asking the Illinois Appellate Court to refrain from extending to malpractice litigation against an insurance broker the common-interest exception to the attorney-client privilege that the Illinois Supreme Court adopted in an insurance coverage case — Waste Management v. International Surplus Lines Insurance Co., 144 Ill. 2d 178 (1991) — two tort plaintiffs (the foundations that, combined, used to be the second largest shareholder in the Tribune Co.) relied on Allianz v. Guidant, 373 Ill. App. 3d 652 (2007 …