MacKey v. Mendoza-Martinez

Background

A man born in the United States who also holds Mexican nationality sued for a declaration that he remains a U.S. citizen. The Government had relied on Section 401(j) of the Nationality Act, which says a U.S. national may lose citizenship by leaving the country in wartime to avoid military service. A prior District Court and the Court of Appeals had held he lost citizenship, but after the Court’s decision in Trop v. Dulles the District Court later found Section 401(j) unconstitutional and declared him a citizen.

Reasoning

After argument, the Court asked whether the man’s 1947 conviction for draft evasion already decided his citizenship and therefore barred relitigation. The parties filed briefs addressing whether that earlier criminal judgment necessarily included an adjudication of citizenship. Because that procedural question—whether the conviction precludes reopening citizenship—might decide the case, the Court chose not to rule on the constitutionality of Section 401(j) and instead sent the case back to the District Court so the parties could amend pleadings and obtain a clear decision on relitigation.

Real world impact

The ruling sends the dispute back to the lower court to determine if the 1947 conviction prevents this suit, which could end the case without resolving the constitutional question. It postpones any nationwide decision about laws that strip citizenship for evading military service.

Dissents or concurrances

Justice Frankfurter preferred vacating earlier proceedings and clearing the record, while Justice Clark (joined by two others) would have decided the relitigation issue here to avoid further delay.