No. 211, Docket 24251. Argued January 11, 1957. Decided March 18, 1957. Theophil C. Kammholtz, Gen. Counsel, Stephen Leonard, Assoc. Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Samuel M. Singer and Florian J. Bartosic, Attys., N.L.R.B., Washington, D.C., for petitioner. Charles J. Barnhill and David L. Dickson, Chicago, Ill., and T.W. Madden, New York, N.Y., for respondent. Before CLARK, Chief Judge, and LUMBARD and WATERMAN, Circuit Judges. LUMBARD, Circuit Judge. The National Labor