No. 72-1277. Argued January 16, 1973. Decided September 28, 1973. Jerry D. Anker, Washington, D.C., for petitioners. Elliott Moore, Atty., N.L.R.B., with whom Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., at the time the brief was filed, was on the brief, for respondent. David M. Heilbron, San Francisco, Cal., with whom William W. Schwarzer, San Francisco, Cal., and Bernard Marcus, New Orleans, La., were on the brief, for intervenors. Petition for review from the National Labor Relations Board