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