No. 79-1252. Argued February 6, 1980. Decided September 10, 1980. Leonard E. Cohen, Baltimore, Md. (Jeffrey Rockman, Frank, Bernstein, Conaway Goldman, Baltimore, Md., on brief), for petitioner. Norton J. Come, Deputy Associate Gen. Counsel, Washington, D.C. (John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, Christopher W. Katzenbach, N.L.R.B., Washington, D.C., on brief), for respondent