Question: what groups of workers did the knights of labor represent
[{'answer': 'low skilled workers', 'provenance': [{'wikipedia_id': '17387', 'title': 'Knights of Labor', 'start_paragraph_id': 4, 'start_character': 826, 'end_paragraph_id': 4, 'end_character': 845, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'answer': 'railroad workers', 'provenance': [{'wikipedia_id': '17387', 'title': 'Knights of Labor', 'start_paragraph_id': 4, 'start_character': 847, 'end_paragraph_id': 4, 'end_character': 863, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'answer': 'immigrants', 'provenance': [{'wikipedia_id': '17387', 'title': 'Knights of Labor', 'start_paragraph_id': 4, 'start_character': 865, 'end_paragraph_id': 4, 'end_character': 875, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'answer': 'steel workers', 'provenance': [{'wikipedia_id': '17387', 'title': 'Knights of Labor', 'start_paragraph_id': 4, 'start_character': 881, 'end_paragraph_id': 4, 'end_character': 894, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'provenance': [{'wikipedia_id': '17387', 'title': 'Knights of Labor', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 894, 'bleu_score': 0.9564238620044221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9982415869375294372}, 'section': 'Section::::Origins.\n'}]}]