More can be written about this, but you might start with "I've heard people mention that black people owned slaves in American history--what data exists to support this and could any of those be black people trying to free slaves?" by /u/sowser .

A useful qualification is in "Did Black slave owners exist if they did how where they viewed by blacks, whites and Free People of colour?" by /u/AnAmenableAnemone .

But as a bracing followup to those: "How prevalent were black slave owners in America?" by /u/freedmenspatrol .

This is not to discourage discussion. More questions, data, and debate are welcome.