Frank Murphy, Overstreet v. North Shore Corporation…
“ The fact that respondent may be subject to state taxation does not imply that it is free from federal regulation or that its road and drawbridge are not instrumentalities of interstate commerce. Petitioners, who are engaged in operating and maintaining respondent's facilities so that there may be interstate passage of persons and goods over them, are so closely related to that interstate movement as a practical matter that we think they must be regarded, under the allegations of their complaint, as 'engaged in commerce' within the meaning of §§ 6 and 7 of the Act. ”
