No. 7257. Argued December 5, 1938. Decided February 27, 1939. On Petition to Review and Set Aside Order of the National Labor Relations Board. Proceeding by the American Federation of Labor and others to set aside an order of the National Labor Relations Board. Petition dismissed. Herbert S. Thatcher and Joseph A. Padway, both of Washington, D.C., for petitioners. Robert B. Watts and Laurence A. Knapp, both of Washington, D.C., for respondent. Before GRONER, Chief Justice, and MILLER and VINSON,