The Young Brothers engaged in a gun battle resulting in the deaths of six law enforcement officers; the worst single killing of US police officers in the 20th century.

The Young Brothers massacre was a gun battle that occurred outside of Brookline, Missouri in the Ozarks region on the afternoon of January 2, 1932, during the period known as the "Public Enemy Era". It resulted in the deaths of six law enforcement officers, making it the worst single killing of US police officers in the 20th century. In 2024, the property that was the site of the massacre was demolished.