No. 85-2918. Argued September 17, 1986. Decided November 21, 1986. Mark Seidman and Elliott Moore, N.L.R.B., Washington, D.C., for N.L.R.B. Lawrence M. Cohen, Fox Grove, Chicago, Ill., for respondent. Appeal from the National Labor Relations Board. Before POSNER and RIPPLE, Circuit Judges, and CAMPBELL, Senior District Judge. Hon. William J. Campbell of the Northern District of Illinois, sitting by designation. POSNER, Circuit Judge. The Labor Board asks us to enforce its order finding that Certified