Why did the New Deal arouse criticism from both the right and the left?

The New Deal aroused criticism from the right for being
excessively "socialist" and from the left for not being liberal
enough.

Before the beginning of the New Deal, the federal
government had never really done much to get involved in the economy.  Conservatives
liked this because they believed in laissez-faire economics.  When President Roosevelt
started the New Deal, they felt that he was pushing the US towards a socialistic,
centrally-planned economy.

On the left, critics felt that
the New Deal did not do enough.  They felt that the government should do more to
directly help poor people.  Two examples of this were Huey Long's "Share the Wealth"
proposal and Francis Townsend's proposal to give money to retired people to
spend.

Thus, Roosevelt's policies were simultaneously
attacked for being too extreme and not extreme enough.