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Suddenly
- annos singulos: 1954
- Patriam: United States of America
- genus: Crime, Thriller
- Studio: Libra Productions Inc.
- keyword: assassin, usa president, film noir, black and white, train, home invasion, secret service, grocery store, held hostage, assassination plan, electrician, tv repairman
- Director: Lewis Allen
- cast: Frank Sinatra, Sterling Hayden, James Gleason, Nancy Gates, Kim Charney, Willis Bouchey