Question: the first african-american union in the us was
[{'answer': 'the National Colored Labor Convention'}, {'provenance': [{'wikipedia_id': '7574954', 'title': 'Colored National Labor Union', 'start_paragraph_id': 5, 'start_character': 1132, 'end_paragraph_id': 5, 'end_character': 1905, 'bleu_score': 0.7612809766292501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1169345169849627741}, 'section': 'Section::::History.\n'}]}]