Hamilton was more than a gangster banker. Before the adoption of the Constitution he tried to set up a Bank of North America type in New York ( a for profit private bank) He failed to do so because the Bank of North America was not renewed by Penn. legislature which killed any chance of NY granting him a similar deal. Hamilton was a great follower of Roger Morris, who used his private bank and his position as superintendent of finance under the Articles of Confederation to supply his own coffers. He was a silent investor in many companies that were hired by the governments to do something. He quickly became unpopular and was being investigated when the new constitution was created (which is why he didn't become Secretary of the Treasury but told Washington to appoint Hamilton, whom believed the same dream as Morris did) This is why we had the First Bank of the United States, a for profit private bank to loan money to the government and to the moneyed men who could afford to loan from it. It practically mirrored the Bank of North America.
Roger Morris's biggest scheme was the collection of war debt bonds. War bonds were being given to men and families who sacrificed their time and/or supplies to help the war effort (i.e. fresh horses, pigs, grain, etc. ). If they were given a war bond worth $100s more than likely that bond was only worth about $6 on the open market. No one was willing to take these bonds for their face value. The rich seeing an opportunity to make a profit could hold on to these bonds and not lose much money as they waited out the war. The poor, however, needed money right away and would sell them for what were pennies on the dollar. Stories are numerous of the average enlisted soldiers getting just enough money on the open market for their war debt bonds to pay for their trip home and nothing more.
As expected war bond speculation became the new thing to do. In Maryland, some 93% of the war bonds were held by only 124 people. So what did the rich want from these seemingly worthless war debt bonds? They wanted the government to redeem them not the going rate in the free market but face value with the original interest rate in specie. Once Hamilton took over as Secretary of the Treasury not only did he guarantee all his moneyed “friends” full face value on all Continental bonds, whom owned almost all the war debt bonds, but he schemed to incorporate state issued bonds into the national debt to guarantee full face value. The only thing he didn’t get was the full interest rate. Rich made out hand over fist. Had the war debt bonds been paid off in 1786 at the free market rate the total debt for the war would have been only 5 Million dollars, instead with the assumption of the 25 million dollar debt held by the states incorporated into the already 40 Million dollar “federal” debt. Hamilton’s “national blessing” became a 65 million dollar debt. In the end those that held onto the war debt bonds made nearly 35 million dollars in pure profit simply by buying the bonds cheaply and lobbying congress to pay in full specie.