Records related to trials of antitrust lawsuits against AT&T. The first part of this subseries is comprised of a transcript of court proceedings in the antitrust lawsuit, MCI Communications Corporation vs AT&T, case No. 74 C 633 in the United States District Court for the Northern District of Illinois, Eastern Division I, before Judge John F. Grady [MCI I]. Next in the subseries are various pleadings, petitions, depositions and exhibits in MCI I. Two groups of records related to the appeal and rehearing of damages of MCI I, and a group of general and miscellaneous records, including records related to the U.S. Department of Justice's antitrust complaint against AT&T [U.S. v. AT&T], complete this subseries: 1. MCI I Trial Transcript [Chronological] 2. MCI I Court Documents [Alphabetical] 3. MCI I Appeal Trial Transcript [Chronological] 4. MCI I Appeal Court Documents [Alphabetical] 5. Other Antitrust Trial Records [Alphabetical].