Nos. 13239, 13353. Argued November 7, 1969. Decided December 18, 1969. J.W. Alexander, Jr., Charlotte, N.C. (Blakeney, Alexander Machen, Charlotte, N.C., on the brief) for petitioner and intervenor National Spinning Company, Inc. Jonathan M. Marks, Washington, D.C. (Arnold M. Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Abigail Cooley Baskir, Washington, D.C., on the brief) for respondent National Labor Relations Board. Joel Ronald