Follwing the great depression in 1929, Franklin D. Roosevelt imposed the "Glass-Stegalll" act which prohibited speculation of peoples savings in banks in the stock market.
Roosevelt, one of the best the US ever had or one of the best leader any country ever had in recent history, turn around the economy and brought back millions of jobs, resurrected health care & social security and was the only president who ran for four terms before the wall street cr00ks brought a law that would restrict president's term to 2 years.
During Bill Clinton's rule, the law was abrogated and laid the foundation to this great depression of 2008 which wiped out billions of dollars across the globe.
Under Obama presidency, FED was asked to print 3 trillion dollars to bail out all major banks but none of the banksters were ever sent to jail.