Government regulates markets. Sorry for the shock to your system but thats life in America.
I know the reality, friend, but you do your IDers no good calling them socialists on FR.
You really need to read some Hayek. In The Road to Serfdom he showed that there was an essential difference between regulating the process, in the form of enforcing simple, clear rules of contract, etc., and regulating the outcome, as happens in centrally planned societies. Free market societies flourish & evolve, while centrally planned societies turn totalitarian and crush the peoples' lives. This is because The People keep getting in the way of The Plan.
Hieronomous explains another system. It is not gov't that regulates the futures market, but the market itself. Many confuse gov't with state, and it could be argued that the market is of the state, but it isn't of gov't. Laws do not create state, but civil laws exist under state.