 Capone himself was very smart about how he moved his money, and how he did business with his numerous establishments which made the investigation harder.However, Wilson was known for being exceptionally thorough and relentless in his search for information.In attempting to find evidence of taxable income received by Capone ally Jake Guzik, Wilson and his agents found that someone going by the name of J.C. Dunbar purchased $300,000 worth of cashier's checks at a bank in Cicero.