This al-Jazeera documentary exposes Charles and David Koch, radical libertarians who use their money to oppose government and virtually all regulation as interference with the free market. They are each worth about $25 billion, which makes them the fourth richest Americans. When you combine their fortunes, they are the third wealthiest people in the world. The Kochs are also in a class of their own as players on the American political stage. Their web of influence in the U.S. stretches from state capitals to the halls of congress in Washington DC.