In the 1929 Wall Street Crash, October 24 was known as Black Thursday.
Black Thursday marked the first major panic of the 1929 crash. Trading volume surged on the New York Stock Exchange as investors rushed to sell shares, and the Dow Jones Industrial Average fell sharply. A group of leading bankers bought heavily to support prices, producing a temporary recovery.
The panic did not end that day. Selling intensified again on October 28, known as Black Monday, and October 29, known as Black Tuesday. Black Tuesday is often treated as the most famous single day of the crash, but Black Thursday came first and signaled that the speculative boom had broken.
The crash was followed by a prolonged economic contraction that became the Great Depression. The market collapse was an important trigger and symbol of that crisis, although historians also identify banking failures, debt problems, and falling demand as major causes.