Felix Frankfurter,
Public Utilities Commission of Ohio v…
“ It is indisputable, therefore, that if the Ohio Commission today made the orders complained of in this suit, it would be intruding in a domain reserved to the federal regulatory body. The power to fix rates for natural gas transported and sold in interstate commerce has been entrusted solely to the Federal Power Commission. It does not follow, of course, that the Act bars a state commission, in the appropriate exercise of its jurisdiction, from compelling the production of evidence relevant to the proceeding before it. ”
