Necessary and Proper Clause.

All grants of power to Con- gress in § 8, as elsewhere, must be read in conjunction with the Necessary and Proper Clause, § 8, cl. 18, which authorizes Congress “[t]o make all Laws which shall be necessary and proper for carrying into Execution the foregoing powers.” Chief Justice Marshall alluded to the power thus enhanced by this clause when he said that the regulatory power did not extend “to those internal concerns [of a state] . . . with which it is not necessary to interfere, for the purpose of executing some of the general powers of the government.”698 There are numerous cases permitting Congress to reach “purely” intrastate activities on the theory, combined with the previously mentioned emphasis on the cumulative effect of minor transactions, that it is necessary to regulate them in order that the regulation of interstate activities might be fully effectuated.699 In other cases, the clause may not have been directly cited, but the dictates of Chief Justice Marshall have been used to justify more expansive applications of the commerce power.700


Gibbons v. Ogden, 22 U.S. (9 Wheat.) 1, 195 (1824). back
E.g., Houston & Texas Ry. v. United States, 234 U.S. 342 (1914) (necessary for ICC to regulate rates of an intrastate train in order to effectuate its rate setting for a competing interstate train); Wisconsin R.R. Comm’n v. Chicago, B. & Q. R.R., 257 U.S. 563 (1922) (same); Southern Ry. v. United States, 222 U.S. 20 (1911) (upholding requirement of same safety equipment on intrastate as interstate trains). See also Wickard v. Filburn, 317 U.S. 111 (1942); United States v. Wrightwood Dairy Co., 315 U.S. 110 (1942); Gonzales v. Raich, 545 U.S. 1 (2005). back
See, e.g., United States v. Darby, 312 U.S. 100, 115–16 (1941). back