Antitrust enforcement : joint hearing before the Subcommittee on Antitrust and Monopoly of the Committee on the Judiciary and the Subcommittee for Consumers of the Senate Commerce Committee, United States Senate, Ninety-fourth Congress, first session, on S. 1136, the Antitrust enforcement authorization act of 1975, and S. 449, the Antitrust enforcement act of 1975, June 10 and 11, 1975