Question: what is the united mine workers of america
[{'answer': 'a North American labor union', 'provenance': [{'wikipedia_id': '219724', 'title': 'United Mine Workers', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '219724', 'title': 'United Mine Workers', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 796, 'bleu_score': 0.9846731957240711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17773192244249203207}, 'section': 'Section::::Abstract.'}]}]