United States v. Hayes, 555 U.S. 415 (2009), is a United States Supreme Court case interpreting Section 921(a)(33)(A) of the federal Gun Control Act of 1968, as amended in 1996. The Court held that a domestic relationship is not necessarily a defining element of the predicate offense to support a conviction for possession of a firearm by a person previously convicted of a misdemeanor crime of domestic violence.