The Gun-Free School Zones Act of 1990 is unconstitutional. The Commerce Clause of the Constitution does not give Congress the power to prohibit the mere possession of a gun near a school because gun possession by itself is not an economic activity that affects interstate commerce even indirectly. Notable because it was the first time since the New Deal that the Supreme Court invalidated a law which was passed by Congress ostensibly permissible under the Commerce Clause. Decided April 26, 1995 (argued November 8, 1994). Opinion of the Court: William Rehnquist → go there Dissenting: Stevens, Souter, Breyer. Topic: Federalism. United States v. Lopez, 514 U.S. 549 (1995), is a landmark case of the United States Supreme Court that struck down the Gun-Free School Zones Act of 1990 (GFSZA), determining that it was not a valid exercise of Congress's power to regulate interstate commerce. It was the first case since 1937 in which the Court held that Congress had exceeded its power under the Commerce Clause. Wiki link