No. 76-1465. Argued November 10, 1976. Decided May 9, 1977. Joe H. Clark, Atlanta, Ga. (David M. Vaughan, Elarbee, Clark Paul, Atlanta, Ga., on brief), for petitioner. Joseph P. Norelli, Atty., N.L.R.B., Washington, D.C. (John S. Irving, Jr., Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Carl L. Taylor, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, Jay E. Shanklin, Atty., N.L.R.B., Washington, D.C., on brief), for respondent. Petition for review from the National