Nos. 85-1752, 85-1848. Argued December 12, 1985. Decided April 23, 1986. Fred Howard, Elliott Moore, Washington, D.C., for petitioner. Joel A. D'Alba, Asher, Pavalon, Gittler Greenfield, Ltd., Chicago, Ill., Ronald C. Henson, Ford Harrison, Atlanta, Ga., for respondent. Petition for review from the National Labor Relations Board. Before COFFEY, FLAUM, and RIPPLE, Circuit Judges. FLAUM, Circuit Judge. This appeal arises from challenges to a union decertification election that occurred over six years