No. 15675. April 18, 1967. Richard L. Marcus, R. Theodore Clark, Jr., Chicago, Ill., Seyfarth, Shaw, Fairweather Geraldson, Chicago, Ill., of counsel, for petitioners. Joseph E. Finley, Melvin S. Schwarzwald, Cleveland, Ohio, Metzenbaum, Gaines, Schwartz, Krupansky, Finley Stern, Cleveland, Ohio, of counsel, for intervenor. Marcel Mallet-Prevost, Asst. Gen. Counsel, Malcolm David Schultz, Atty., N.L.R.B., Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, George B. Driesen,