The history of liberty is the history of the observances of procedural safeguards.

Felix Frankfurter (1882–1965) American jurist, teacher; US Supreme Court Justice (1939–62)

McNabb v. United States, 318 U.S. 332, 347 (1943) [majority opinion]
    (Source)

The ruling determined a defendant's confession was inadmissible as evidence in federal court if the government had disregarded the legal requirement to bring them promptly before a judge or magistrate.