435 U.S. 850 98 S.Ct. 1547 56 L.Ed.2d 18 UNITED STATES, Petitioner,v.Jeffrey R. MacDONALD. No. 75-1892. Argued Jan. 9, 1978. Decided May 1, 1978. Syllabus A defendant may not, before trial, appeal a federal district court’s order denying his motion to dismiss an indictment because of an alleged violation of his Sixth Amendment right to […]