Amendments to the rules of criminal procedure for the U.S. district courts : communication from the Chief Justice of the United States transmitting amendments to the rules of criminal procedure for the U.S. district courts, adopted by the Supreme Court pursuant to 18 U.S.C. 3771 and 3772, together with the report of the Judicial Conference of the United States submitted to the Court pursuant to 28 U.S.C. 331.