The Colfax massacre, sometimes referred to as the Colfax riot, occurred on Easter Sunday, April 13, 1873, in Colfax, Louisiana, the parish seat of Grant Parish. An estimated 62–153 Black militia men were murdered while surrendering to a mob of former Confederate soldiers and members of the Ku Klux Klan. Three white men also died during the confrontation.
https://en.m.wikipedia.org/wiki/Colfax_massacre