Mr. Donald C. McCreery, with whom Messrs. Paul W. Lee, George H. Shaw and Wm. A. Bryans, III were on the brief, for petitioner. Mr. Charles V. Shannon, with whom Solicitor General Fahy, Assistant Attorney General Shea, Messrs. Chester T. Lane, Paul A. Sweeney, Harry S. Littman, Stanley M. Morley and Louis J. O'Marr, Attorney General of Wyoming, for the Federal Power Commission et al., respondents.