No. 75-1809. Argued April 6, 1976. Decided June 22, 1976. Alfred J. Hill, Wilentz, Goldman Spitzer, Perth Amboy, N. J., for Suburban Transit Corp. Paul J. Spielberg, John G. Elligers, John S. Irving, Elliott Moore, Washington, D.C., for N.L.R.B. Mirkin, Barre, Saltzstein Gordon, Robert M. Saltzstein, Great Neck, N. Y., Robert M. Ziskin, for United Transportation Union, Lodge 1589. Howard E. Perlstein, N.L.R.B., Washington, D.C., for respondent. Petition for review from the National Labor Relations