Civ. A. Nos. 85-2571, 86-2291. December 9, 1986. David R. Addis, Joseph E. Kolick, Jr. and Ellen M. Athas of Dickstein, Shapiro Morin, Washington, D.C., for plaintiffs. Stuart H. Newberger, Asst. U.S. Atty., and Anthony W. DuComb, U.S. Postal Service, Office of Labor Law, Washington, D.C., for defendant. CHARLES R. RICHEY, District Judge. I. INTRODUCTION CHARLES R. RICHEY, District Judge. Pending before the Court are defendant's motion to dismiss or for summary judgment, plaintiffs' cross motion