
    No. 87-636.
    Karahalios v. National Federation of Federal Employees, Local 1263. Alberta Gas Chemicals Ltd. et al. v. E. I. du Pont de Nemours & Co. et al.
    No. 87-652.
   C. A. 9th Cir.; and

C. A. 3d Cir. The Solicitor General is invited to file briefs in these cases expressing the views of the United States.  