Nos. 23083, 23214. December 4, 1967. Richard C. Keenan, New Orleans, La., Wells T. Lovett, Owensboro, Ky., Winthrop A. Johns, Washington, D.C. (amicus curiae) for petitioner Markwell and Hartz, Inc. Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., Morton J. Come, Atty., N.L.R.B., Louis Sherman, (intervenor) Charles R. Donnenfeld, Washington D.C. (intervenor), for respondent N.L.R.B. Marcel Mallet-Provost, Asst. Gen. Counsel, N.L.R.B., Morton J. Come, Atty., N.L.R.B., Winthrop A. Johns, Washington