“Hearing Before the Subcommittee on Antitrust and Monopoly of the Committee on the Judiciary, United States Senate, Eighty-sixth Congress, First Session, Pursuant to S. Res. 57, on S. 716 and S. 1003, Bills to Authorize the Attorney General to Compel the Production of Documentary Material Required in Civil Investigations for the Enforcement of the Antitrust Laws, and for Other Purposes. March 3, 1959”