Nos. 90-2543, 90-2683. Argued January 23, 1991. Decided August 28, 1991. Robert E. Gordon, argued, Chicago, Ill., for J. Huizinga Cartage Co., Inc. and Simpson Motor Transp., Inc. John C. Truesdale, N.L.R.B., Contempt Litigation Branch, Aileen A. Armstrong, William Mascioli, argued, N.L.R.B., Appellate Court, Enforcement Litigation, Washington, D.C., and Elizabeth Kinney, Ann Crane and John W. Peck, N.L.R.B., Region 13, Chicago, Ill., for N.L.R.B. Petition for review from the National Labor Relations