No. 75-2261. Argued January 11, 1977. Decided March 31, 1977. Hugh J. Beins, Washington, D.C., with whom Thomas H. Kohn, Arlington, Va., was on the brief, for petitioner. Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., with whom John S. Irving, Jr., Gen. Counsel and John F. Depenbrock, Jr., Atty., N.L.R.B., Washington, D.C., were on the brief, for respondent. Fred W. Elarbee, Jr., Atlanta, Ga., with whom Robert L. Thompson, Atlanta, Ga., was on the brief, for intervenor. Petition for Review