No. 73-1704. Argued October 31, 1974. Decided December 23, 1974. Angelo V. Arcadipane, Washington, D.C., for petitioner. Charles P. Donnelly, Atty., N.L.R.B., of the bar of the Supreme Court of Texas, pro hac vice, by special leave of court with whom John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and Robert A. Giannasi, Asst. Gen. Counsel, N.L.R.B., were on the brief for respondent. Petition for review from the National Labor