MR. CHIEF JUSTICE WARREN delivered the opinion of the Court.
The questions for decision are whether the Secretary of State is statutorily authorized to refuse to validate the passports of United States citizens for travel to Cuba, and, if he is, whether the exercise of that authority is constitutionally permissible. We answer both questions in the affirmative.
Prior to 1961 no passport was required for travel anywhere in the Western Hemisphere. On January...
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