Authorization for Department of Justice to Make Demand for Evidence in Civil Antitrust Investigations: Hearing Before the Subcommittee on Antitrust and Monopoly of the Committee on the Judiciary, United States Senate, Eighty-seventh Congress, First Session, Pursuant to S. Res. 52 on S. 167, a Bill to Authorize the Attorney General to Compel the Production of Documentary Evidence Required in Civil Investigations for the Enforcement of the Antitrust Laws, and for Other Purposes. June 7, 1961