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The original was posted on /r/todayilearned by /u/metaldrummerx on 2025-05-29 20:38:14+00:00.

Original Title: TIL that on March 18, 1919, the entire city of New Orleans stayed up the all night playing loud jazz music at every bar and household for fear that a serial killer would murder thousands of people based on a letter written to the local newspaper.