Question: Harold Robert Isaacs, was an American journalist and political scientist, Isaacs went to China in 1930 and became involved with left wing politics in Shanghai and wrote "The Tragedy of the Chinese Revolution", about the Chinese Revolution of 1925-27, first published with a preface by which now deceased, Marxist revolutionary, theorist, and Soviet politician?
{'answer': 'Leon Trotsky', 'supporting_facts': [['Harold Isaacs', 1], ['Leon Trotsky', 0]]}