Arthur Goldberg,
Federal Power Commission v. Union Electric Company…
“ When it confers the power to regulate commerce among the States, et cetera, that is not a definition of what commerce is or the extent to which Congress may control streams. The Supreme Court has held, as I understand, that tributaries of tributaries of other tributaries, if any part of such tributary of the final stream was navigable, would be under the cognizance of the Federal Government. ”
