Whether the Constitution's criminal-procedure protections apply when the United States prosecutes an American citizen abroad.
Holding
Yes. Justice Black's plurality concluded that the United States remains bound by the Constitution, including Article III and the Fifth and Sixth Amendments, when it acts against American citizens abroad.
Reasoning
The federal government is a creature of the Constitution and has no source of authority independent of it. When the Government reaches beyond the Nation's borders to punish a citizen, it cannot strip that citizen of constitutional protections merely because the alleged crime occurred in another country.
Article III expressly contemplates crimes committed outside any State and requires that Congress designate the place of trial. The Fifth and Sixth Amendments likewise use expansive language—protecting "no person" and applying to "all criminal prosecutions"—that does not create an overseas exception for citizens prosecuted by the United States.
The plurality rejected In re Ross as a relic of the consular-court system and declined to extend the Insular Cases. Ross arose from a historically exceptional regime of consular jurisdiction in foreign nations, while the Insular Cases concerned Congress's governance of newly acquired territories with different legal traditions. Neither justified military trial of American civilian dependents abroad.