United States v. Sharpnack

Congress's Assimilative Crimes Act made conduct on a federal enclave punishable under the surrounding state's law whenever that conduct was not independently punishable under federal law. Sharpnack (defendant) was convicted under a state law that the surrounding state enacted after Congress passed the assimilation statute, for conduct that occurred within a federal enclave and was not itself a federal crime, and he challenged the statute's constitutionality on appeal.