Question: supreme court case which established the clear-and-present danger test for restricting expression
[{'answer': 'Schenck v. United States', 'provenance': [{'wikipedia_id': '45254', 'title': 'Clear and present danger', 'start_paragraph_id': 4, 'start_character': 146, 'end_paragraph_id': 4, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '45254', 'title': 'Clear and present danger', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 872, 'bleu_score': 0.985764216565234, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8667153437494626694}, 'section': 'Section::::History.\n'}]}]