No. 621, Docket 88-4111. Argued December 18, 1989. Decided March 6, 1990. Amy J. Carroll, Casey, Sanchez, Jones, Amigone Kelleher, Buffalo (Vincent J. Sanchez, of counsel), for respondents-appellants. William A. Baudler, Atty., N.L.R.B., Washington, D.C. (Paul J. Spielberg, Deputy Asst. Gen. Counsel, Joseph E. Desio, Acting Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Aileen A. Armstrong, Deputy Associate Gen. Counsel, N.L.R.B., of counsel), for petitioner-appellee. Petition from the National