How did FDR's New Deal destroy capitalism/free enterprise system?

FDR was probably the greates American president. His "New Deal" saved America from corporate greed and power. His monopoly busting (of mega corporations) saved America (for a time) from runaway corporate greed and influence, but in the last 50 years almost all his hard work has been undone leaving America (and the world) victims to the giant mega corporations greed and power.