You can find the source via audio clip from a netflix special called "13TH", which is about racial injustice and the prison system, I'm almost certain this was

You can find the source via audio clip from a netflix special called "13TH", which is about racial injustice and the prison system, I'm almost certain this was quoted in the documentary. EDIT: It's about 18 minutes into the documentary, but I'm finding out their source is Harpers.