The Federal Deposit Insurance Corporation (FDIC) was created in in 1933 and it was to protect bank depositors and ensure a level of trust in the American banking system, during the Great Depression.
The Exchange Commission (SEC) was created in 1934 and the goal was to to help investors feel comfortable to put money back into the stock market.
Both were important to create confidence in american people, and to create the possibility to get out of the Great Depression.