In Crutcher _v._ Kentucky[629] a like result was reached, without assistance from an act of Congress, with respect to a Kentucky statute which provided that the agent of an express company not incorporated by the laws of that State should not carry on business there without first obtaining a license from the State, and that, preliminary thereto, he must satisfy the auditor of the State that the company he represented was possessed of an actual capital of at least $150,000. The act was held to be a regulation of interstate commerce so far as applied to a corporation of another State in that business. "To carry on interstate commerce," said the Court, "is not a franchise or a privilege granted by the State; it is a right which every citizen of the United States is entitled to exercise under the Constitution and laws of the United States; and the accession of mere corporate facilities, as a matter of convenience in carrying on their business, cannot have the effect of depriving them of such right, unless Congress should see fit to interpose some contrary regulation on the subject."[630] LICENSE TAXES The demand for what in effect is a license is, of course, capable of assuming various guises. In Ozark Pipe Line _v._ Monier[631] an annual franchise tax on foreign corporations equal to one-tenth of one per cent of the par value of their capital stock and surplus employed in business in the State was found to be a privilege tax, and hence one which could not be exacted of a foreign corporation whose business in the taxing State consisted exclusively of the operation of a pipe line for transporting petroleum through the State in interstate commerce, and of activities the sole purpose of which was the furtherance of its interstate business. Likewise a Massachusetts tax based on "the corporate surplus" of a foreign corporation having only an office in the State for the transaction of interstate business was held in Alpha Portland Cement Co. _v._ Massachusetts to be virtually an attempt to license interstate commerce.[632] In the same category of unconstitutional taxation of the interstate commerce privilege, the Court has also included the following: a State "franchise" tax on a foreign corporation, whose sole business in the State consisted in landing, storing and selling in the original package goods imported by it from abroad, the tax being imposed annually on the doing of such business and measured by the value of the goods on hand;[633] a State privilege or occupation tax on every corporation engaged in the business of operating and maintaining telephone lines and furnishing telephone service in the State, of so much for each telephonic instrument controlled and operated by it, as applied to a company furnishing both interstate and intrastate service, and employing the same telephones, wires, etc., in both as integrated parts of its system;[634] a State occupation tax measured by the entire gross receipts of the business of