No. 21289. Argued March 22, 1968. Decided December 3, 1968. Mr. Jerry D. Anker, Washington, D.C., with whom Mr. James J. Cronin, Washington, D.C., was on the brief, for petitioner. Mr. Gary Green, Atty., National Labor Relations Board, with whom Messrs. Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel, and Marcel Mallet-Prevost, Asst. General Counsel, National Labor Relations Board, were on the brief, for respondent. Mr. David D. Johnson, Charleston, W. Va., with whom