I think its Frightened depositors feared for their money and tried to withdraw it from their banks.
Banks were among the first institutions affected by the 1929 stock market crash due to their significant investments in stocks, lack of cash reserves, increased bank runs, and subsequent tightening of credit. This resulted in bank failures that devastated communities and further deepened the economic crisis. The interconnected financial system meant that the effects of the crash rippled through the entire economy.
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