On January 13, 1875, in response to a Senate resolution, Ulysses S. Grant offered his views on violence in Louisiana politics during Reconstruction.
Rather than give you a lot of background, I simply thought I’d link to the speech here. In it he recounts events such as the massacre of some one hundred African Americans in Colfax, Louisiana, on April 13, 1873, as well as a series of other events, notably the assassination of Republican officeholders at Coushatta.