First, we have upheld a wide variety of congressional Acts regulating intrastate economic activity where we have concluded that the activity substantially affected interstate commerce. Examples include the regulation of intrastate coal mining; intrastate extortionate credit transactions, restaurants utilizing substantial interstate supplies, McClung, supra, inns and hotels catering to interstate guests, Heart of Atlanta Motel, supra, and production and consumption of home-grown wheat, Wickard. These examples are by no means exhaustive, but the pattern is clear. Where economic activity substantially affects interstate commerce, legislation regulating that activity will be sustained.
Even Wickard, which is perhaps the most far reaching example of Commerce Clause authority over intrastate activity, involved economic activity in a way that the possession of a gun in a school zone does not. . . .
Section 922(q) is a criminal statute that by its terms has nothing to do with “commerce” or any sort of economic enterprise, however broadly one might define those terms. Section 922(q) is not an essential part of a larger regulation of economic activity, in which the regulatory scheme could be undercut unless the intrastate activity were regulated. It cannot, therefore, be sustained under our cases upholding regulations of activities that arise out of or are connected with a commercial transaction, which viewed in the aggregate, substantially affects interstate commerce.