
    No. 80-757.
    No. 80-895.
    No. 80-936.
    New York Mercantile Exchange et al. v. Leist et al.; Clayton Brokerage Co. of St. Louis, Inc. v. Leist et al.; and Heinold Commodities, Inc., et al. v. Leist et al.
   C. A. 2d Cir. Motion of Board of Trade of the City of Chicago et al. for leave to file a brief as amici curiae in No. 80-757 granted. Motion of Futures Industry Association for leave to file a brief as amicus curiae in No. 80-936 granted. Certiorari granted, cases consolidated, and a total of one hour allotted for oral argument. Reported below: 638 F. 2d 283.  