Question: Who was a Jewish American mobster that was known as one of the most "infamous and feared gangsters of his day" and was also an associate and childhood friend of Harry Schachter or Harry "Big Greenie" Greenberg and ended up murdering him along with Whitey Krakow?
{'answer': 'Bugsy Siegel', 'supporting_facts': [['Harry Greenberg', 0], ['Harry Greenberg', 1], ['Bugsy Siegel', 0], ['Bugsy Siegel', 1]]}