No. 73-2121. Heard November 19, 1974. Decided February 26, 1975. Lester Asher and Stephen B. Rubin, Chicago, Ill., for intervenor. Arthur B. Muchin, Chicago, Ill., for petitioner. Elliott Moore and Joseph E. Mayer, N.L.R.B., Washington, D.C., for respondent. Petition for review from the National Labor Relations Board. Before SWYGERT and CUMMINGS, Circuit Judges, and WYZANSKI, Senior District Judge. Senior District Judge Charles E. Wyzanski, Jr. of the District of Massachusetts is sitting by designation