No. 10396. Argued December 12, 1949. Decided February 20, 1950. Mr. A. Norman Somers, Assistant General Counsel, National Labor Relations Board, Washington, D.C., for appellants. Mr. Henry Mayer, of the Bar of the Court of Appeals of New York, New York City, pro hac vice, by special leave of Court, with whom Messrs. Ellis W. Manning and Leonard E. Ackermann, Washington, D.C., were on the brief, for appellee. Before CLARK, PRETTYMAN and BAZELON, Circuit judges. CLARK, Circuit Judge. The principal