From time to time the Court has said that certain things were not interstate commerce, such as mining or manufacturing undertaken "with the intent" that the product shall be transported to other States;[314] insurance transactions when carried on across State lines;[315] exhibitions of baseball between professional teams which travel from State to State;[316] the making of contracts for the insertion of advertisements in periodicals in another State;[317] contracts for personal services to be rendered in another State.[318] Recent decisions either overturn or cast doubt on most if not all of these holdings. By one of these the gathering of news by a press association and its transmission to client newspapers is termed interstate commerce.[319] By another the activities of a Group Health Association which serves only its own members are held to be "trade" within the protection of the Sherman Act and hence capable, if extended, of becoming interstate commerce.[320] By a third the business of insurance when transacted between an insurer and an insured in different States is interstate commerce.[321] THE "NECESSARY AND PROPER" CLAUSE In the majority of the above cases the commerce clause was involved solely as a limitation on the powers of the States. But when the clause is treated as a source of national power it is, of course, read in association with the power of Congress "* * * To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, * * *,"[322] with the result that, as is pointed out later, "interstate commerce" has come in recent years practically to connote both those operations which precede as well as those which follow commercial intercourse itself, provided such operations are deemed by the Court to be capable of "affecting" such intercourse.[323] "AMONG THE SEVERAL STATES" In Cohens _v._ Virginia, decided in 1821, Marshall had asserted, "for all commercial purposes we are one nation."[324] In Gibbons _v._ Ogden, however, he conceded that the phrase commerce "among the several States" was "not one which would probably have been selected to indicate the completely interior traffic of a State"; and added: "The genius and character of the whole government seem to be, that its action is to be applied to all external concerns of the nation, and to those internal concerns which affect the States generally; but not those which are completely within a particular State, which do not affect other States, and with which it is not necessary to interfere, for the purpose of executing some of the general powers of the government."[325]