Here are some sources and quotes: "In 1830 there were 3,775 free black people who owned 12,740 black slaves."
9 ‘Facts’ About Slavery They Don’t Want You to Know by snopes. I very much doubt that that is most, but I get the point.

"African traders of enslaved people felt no obligation to protect enslaved Africans because they did not regard them as their equals."
African Traders of Enslaved People by thoughtco