MD North Carolina April 1974 casesC.P. Robinson Const. v. Natl. Corp. for Hous. Part.Witcher v. Mac Tools, Inc.United States v. NelsonPilot Freight Carriers, Inc. v. Local 391, Intern. Broth. of Teamsters, Chauffeurs, Warehousemen, and Helpers of America (hereafter called '391 IBT')