## Facts

- Ellen (Helene) Knauff, a German-born alien and refugee from Nazi-era Europe, served with the Royal Air Force during World War II and later worked for the U.S. War Department in Germany.
- In 1948, she married Kurt W. Knauff, a naturalized U.S. citizen and honorably discharged U.S. Army veteran, while both were in Frankfurt.
- She sought admission to the United States under the War Brides Act, which eased certain immigration requirements for qualifying spouses of U.S. service members.
- Upon arrival at a U.S. port of entry, she was detained at Ellis Island and temporarily excluded.
- Acting under emergency authority stemming from the Act of June 21, 1941, Presidential Proclamation No. 2523, and related regulations, the Attorney General relied on confidential information deemed too sensitive to disclose and ordered Knauff’s permanent exclusion without a hearing because her admission would be prejudicial to U.S. interests.

## Issues

1. Whether the Attorney General could lawfully exclude an arriving alien without a hearing based on confidential security information under wartime emergency statutes, proclamations, and regulations.
2. Whether exclusion without a hearing violated due process, including in light of Knauff’s marriage to a U.S. citizen and asserted eligibility under the War Brides Act.
3. Whether courts may review the substance of such exclusion decisions absent express statutory authorization.

## Decision

- The Supreme Court affirmed the dismissal of Knauff’s habeas petition and upheld her exclusion.
- The Court held that the emergency regime authorized exclusion without a hearing when the Attorney General determines admission would be prejudicial to U.S. interests and the supporting information cannot be disclosed for security reasons.
- The Court ruled that, for an alien seeking initial entry, admission is a privilege and the procedure Congress authorizes for exclusion constitutes due process as to that person.
- The Court concluded that exclusion decisions by the political branches are final and conclusive and are not subject to judicial review unless Congress expressly provides otherwise.
- The Court held that the War Brides Act did not require admission because it applied only to applicants who were otherwise admissible; the security-based inadmissibility determination controlled.

## Legal Principles

- The political branches possess broad authority to exclude aliens at the threshold of initial entry, including in matters tied to national security.
- For an arriving alien denied admission, due process is satisfied by whatever exclusion procedure Congress has authorized for that context.
- Courts generally may not review the merits or evidentiary basis of an exclusion decision unless a statute expressly grants such review.
- Statutes granting special entry benefits (such as for certain spouses) do not override independent grounds of inadmissibility where the statute conditions relief on being “otherwise admissible.”
- An alien outside the United States seeking admission has no vested right of entry that limits application of valid regulations governing admissibility.

## Conclusion

The Court sustained the executive’s power to exclude an arriving alien without a hearing on confidential security grounds under congressionally authorized emergency procedures, held that such procedures satisfy due process for applicants at the border, and limited judicial review absent explicit statutory permission.


United States ex rel. Knauff v. Shaughnessy, 338 U.S. 537 (1950)