Who was the author of Das Kapital and formed the belief of Marxism?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q183', 'id': 0, 'label': 'Germany'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q7264', 'id': 1, 'label': 'Marxism'}, {'type': 'INTERNAL', 'name_': 'Q883448', 'id': 2, 'label': 'Association for Solidarity Perspectives'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q58784', 'id': 3, 'label': 'Capital: A Critique of Political Economy'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P17', 'source': 2, 'target': 0, 'label': 'country'}, {'name_': 'P1142', 'source': 2, 'target': 1, 'label': 'political ideology'}, {'name_': 'P495', 'source': 3, 'target': 0, 'label': 'country of origin'}, {'name_': 'P135', 'source': 3, 'target': 1, 'label': 'movement'}]}