Final answer:
Nathan Bedford Forrest was a Confederate soldier and the founder of the Ku Klux Klan. He was convicted of war crimes and sentenced to hang for his role in the massacre of black Union soldiers at Fort Pillow, Tennessee.
Step-by-step explanation:
The person described in your question is Nathan Bedford Forrest. He was a Confederate soldier and the founder of the Ku Klux Klan. Forrest is notorious for leading the massacre of black Union soldiers at Fort Pillow, Tennessee during the American Civil War. He was tried for war crimes and sentenced to hang in October 1865.