The Supreme Court held that Congress could not authorize the military to deprive a soldier of his citizenship. A plurality of four justices wanted to rule that expatriation was a cruel and unusual punishment, violating the Eighth Amendment.
Based on several acts of Congress, Albert Trop was sentenced to involuntary expatriation for the crime of wartime desertion. By a 5-4 vote, the Supreme Court overturned the sentence on narrow grounds. Speaking for a plurality, Chief Justice Earl Warren
On the same day that Trop was announced, the Court also issued a companion decision, Perez v. Brownell
Cruel and unusual punishment