Vichy France arrests 13 over a 'Communist April Fool plot'
1941
In 1941 the Vichy government arrested thirteen people over what it described as a Communist April Fool plot to rename streets. The episode is a striking documented instance of an authoritarian state treating an April Fools' prank as subversion, and of the custom persisting under occupation.
Source: hoaxes.org
Part of Pranks · Watch in the documentary