"United States v. Lanza" was one of a series of cases involving Prohibition. Lanza committed acts allegedly in violation of both state and federal law, and was first convicted in Washington state court, then prosecuted in federal district court. He alleged the second prosecution in violation of the Double Jeopardy Clause of the Fifth Amendment. Taft, for a unanimous court, allowed the second prosecution, holding that the state and federal governments were dual sovereigns, each empowered to prosecute the conduct in question.