No. 11227. Argued October 4, 1967. Decided December 6, 1967. Nancy M. Sherman, Atty., National Labor Relations Board (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Assoc. Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Burton L. Raimi, Atty., National Labor Relations Board, on brief), for petitioner. Charles Yumkas, Baltimore, Md. (Jacob Blum, Baltimore, Md. on brief), for respondent. Max H. Frankle, New York City (Bernard Yaker and Vladeck, Elias, Frankle, Vladeck Lewis, New York