Nos. 86-5935, 86-6061. Argued August 17, 1987. Decided November 20, 1987. John P. Caponigro (argued), Frasco, Hackett and Mills, Bloomfield Hills, Mich., for petitioner, cross-respondent. Aileen A. Armstrong, Deputy Associate Gen. Counsel, N.L.R.B., Washington, D.C., Helen L. Morgan, Steven C. Smith, and William R. Stewart (argued), Detroit, Mich., for respondent cross-petitioner. Roger J. McClow, Klimist, McKnight, Sale McClow, Southfield, Mich., for Graphic Communication Intern. Union, intervenor