Question: who was the last person convicted of treason in the united states
[{'answer': 'Tomoya Kawakita', 'provenance': [{'wikipedia_id': '2111515', 'title': 'List of people convicted of treason', 'start_paragraph_id': 185, 'start_character': 12, 'end_paragraph_id': 185, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::United States.\n'}]}, {'provenance': [{'wikipedia_id': '2111515', 'title': 'List of people convicted of treason', 'start_paragraph_id': 185, 'start_character': 0, 'end_paragraph_id': 185, 'end_character': 145, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15219833604428059999}, 'section': 'Section::::United States.\n'}]}]