Alabama v. United States

Whether 8 U.S.C. §1324, which prohibits concealing or harboring unlawfully present aliens, encouraging or inducing them to come into or reside in the United States, or transporting them in furtherance of their unlawful presence, impliedly and facially preempts state laws, such as ALA. CODE "31-13-13, prohibiting a state"s residents from: (a) concealing or harboring aliens who are present in the United States in violation of federal law; (b) encouraging or inducing aliens to enter into or reside in the state, when their entry or residence would violate federal law; or (c) transporting unlawfully present aliens within the state in furtherance of their unlawful presence.