No. 79-1019. Argued September 17, 1980. Decided November 20, 1980. Douglas G. Voeglar, Albuquerque, N. M. (Leonard L. Pickering and Wayne E. Bingham, of Pickering Bingham, Albuquerque, N. M., with him on the brief), for petitioners. L. Joseph Ferrara, Atty., Washington, D.C. (William R. Stewart, Deputy Asst. Gen. Counsel, John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, and Elliott Moore, Deputy Associate Gen. Counsel, N.L.R