18 U.S.C. § 922

18 U.S.C. § 922(g)(1) is a federal law that states that it is unlawful for "any person who has been convicted in any court of, a crime punishable by imprisonment for a term exceeding one year ... to ship or transport in interstate or foreign commerce, or possess in or affecting commerce, any firearm or ammunition; or to receive any firearm or ammunition which has been shipped or transported in interstate or foreign commerce".

This law is often used to obtain convictions in federal court. In United States v. Daugherty, the Fifth Circuit held that it is constitutional.