No. 7600. Argued June 3, 1958. Decided September 12, 1958. Earle K. Shawe and Sidney J. Barban, Baltimore, Md. (William J. Rosenthal, Wilson K. Barnes, and Anderson, Barnes, Coe Morrow, Baltimore, Md., on brief), for petitioners. William J. Avrutis, Atty., N.L.R.B., Washington, D.C. (Jerome D. Fenton, Gen. Counsel; Thomas J. McDermott, Assoc. Gen. Counsel; Marcel Mallet-Prevost, Asst. Gen. Counsel, and Arnold Ordman, Atty., N.L.R.B., Washington, D.C., on brief), for respondent. Thomas E. Bracken