Less than a year after the ruling in United States _v._ South-Eastern Underwriters Association[764] that insurance transactions across State lines constituted interstate commerce, thereby logically establishing their immunity from discriminatory State taxation, Congress passed the McCarran Act[765] authorizing State regulation and taxation of the insurance business; and in Prudential Insurance Co. _v._ Benjamin,[766] a statute of South Carolina which imposed on foreign insurance companies, as a condition of their doing business in the State, an annual tax of three per cent of premiums from business done in South Carolina, while imposing no similar tax on local corporations, was sustained. "Obviously," said Justice Rutledge for the Court, "Congress' purpose was broadly to give support to the existing and future State systems for regulating and taxing the business of insurance. This was done in two ways. One was by removing obstructions which might be thought to flow from its own power, whether dormant or exercised, except as otherwise expressly provided in the Act itself or in future legislation. The other was by declaring expressly and affirmatively that continued State regulation and taxation of this business is in the public interest and that the business and all who engage in it 'shall be subject to' the laws of the several States in these respects. * * * The power of Congress over commerce exercised entirely without reference to coordinated action of the States is not restricted, except as the Constitution expressly provides, by any limitation which forbids it to discriminate against interstate commerce and in favor of local trade. Its plenary scope enables Congress not only to promote but also to prohibit interstate commerce, as it has done frequently and for a great variety of reasons. * * * This broad authority Congress may exercise alone, subject to those limitations, or in conjunction with coordinated action by the States, in which case limitations imposed for the preservation of their powers become inoperative and only those designed to forbid action altogether by any power or combination of powers in our governmental system remain effective."[767] The generality of this language enforces again the sweeping nature of Congress's power to prohibit interstate commerce.[768] The Police Power and Foreign Commerce ORIGIN OF POLICE POWER