Section 1 of the act of 1887 contains the proviso "that the provisions of this act shall not apply to 'transportation' wholly within the State." Section 3 of the act prohibits "any common carrier subject to the provisions" of the act from giving "any unreasonable preference or advantage" to any person, firm, or locality. In the Shreveport Case,[383] decided in 1914, the Commission, reading Sec. 3 independently of Sec. 1, had ordered several Texas lines to increase certain of their rates between points in Texas till they should approximate rates already approved by the Commission to adjoining points in Louisiana. The latter rates, being interstate, were admittedly subject to the Commission. The local rates were as clearly within the normal jurisdiction of the State, and had in fact been set by the Texas Railway Commission. The Court found that the Interstate Commerce Commission had not exceeded its statutory powers. The constitutional objection to the Commission's action was stated thus: "That Congress is impotent to control the intrastate charges of an interstate carrier even to the extent necessary to prevent injurious discrimination against interstate traffic." This objection the Court met, as follows: "Wherever the interstate and intrastate transactions of carriers are so related that the government of the one involves the control of the other, it is Congress, and not the State, that is entitled to prescribe the final and dominant rule, for otherwise Congress would be denied the exercise of its constitutional authority and the State, and not the Nation, would be supreme in the national field."[384] This, the Court continued, "is not to say that Congress possesses the authority to regulate the internal commerce of a State as such, but that it does possess the power to foster and protect interstate commerce, and to take all measures necessary or appropriate to that end, although intrastate transactions of interstate carriers may thereby be controlled."[385] THE ACT OF 1920 AND STATE RAILWAY RATE REGULATION The power of the Commission under Sec. 3 of the act of 1887, as interpreted in the Shreveport Case, was greatly enlarged by Sec. 416 of the act of 1920, which authorizes the Commission to remove "any undue, unreasonable, or unjust discrimination against interstate or foreign commerce." Thus, commerce as a whole, instead of specific firms or localities, is made the beneficiary of the restriction. In the Wisconsin R.R. Comm. _v._ Chicago, B. & Q.R.R. Co.,[386] the Court held that this section sustained the Interstate Commerce Commission in annulling intrastate passenger rates which it found to be unduly low, in comparison with rates which the Commission had established for interstate travel, and so tending to thwart, in deference to a merely local interest, the general purpose of the act to maintain an efficient transport service for the benefit of the country at large.[387] REGULATION OF OTHER AGENTS OF CARRIAGE AND COMMUNICATION