Nos. 24687, 24744. Argued September 15, 1971. Decided February 3, 1972. Mr. Bernard Dunau, Washington, D.C., with whom Messrs. Plato E. Papps, Washington, D.C., and C. Paul Barker, New Orleans, La., were on the brief, for petitioner in No. 24,687 and intervenor in No. 24,744. Mr. C. Dale Stout, New Orleans, La., for petitioner in No. 24,744 and intervenor in No. 24, 687. Mr. Glen M. Bendixsen, Atty., National Labor Relations Board, with whom Messrs. Arnold Ordman, General Counsel, Washington, D.C