By taking constitutional law as a political doctrine, the US constitution establishes that the government is divided in three different branches (executive, legislative and judicial) in order to prevent power abuse from those in the position of authority. This division it's also known as the system of checks and balances, its main function is to keep each of the branches accountable for their decisions.
The programs of the New Deal was created to offer some relief however, the pay was very low for the recipients to actually enjoy and live conveniently. It gave the government a more active role in the society.
Government officials were often bribed and these super corporations had a large lobbying influence and often planted their own people as senators and representatives. The government also made a lot of profit from these mega monopolies and they still do today.
