
    No. 150.
    Silver, doing business as Municipal Securities Co., et al. v. New York Stock Exchange.
    
      David I. Shapiro for petitioners.
    
      A. Donald MacKinnon for respondent.
    
      Solicitor General Cox, Assistant Attorney General Loevinger, Lionel Kestenbaum and Melvin Spaeth for the United States, as amicus curiae, in support of the petition.
   C. A. 2d Cir. Certiorari granted.  