Roosevelt campaigned against Hoover's meddling in the economy, and once elected he became Hoover On Steroids. His actions extended the Great Depression seven years. That's not my opinion, it's the opinion of two UCLA economists.
What did Uncle Milton have to say about the Great Depression?
Here's some more information on the subject. Lefties might call this information "alternative facts". It's certainly an alternative to their mythology--but the rest of us just call this information "fact".