Did you know that from 1932 to 1972 in Tuskegee, Alabaman which 399 poor and mostly illiterate African American sharecroppers were studied to observe the natural progression of the disease if left untreated.
Doctors recruited 399 black men who already had syphilis, to study the progress of the disease over the course of 40 years. A control group of 201 healthy men was studied to provide a comparison.
It is called the "Tuskegee Study of Untreated Syphilis in the Negro Male"
they use blacks, anyone of colour, anyone who join their army, poor people including whites,... they use just about anyone they feel like who ain't got the education to realise &/or the money to do anything about it. But yer Blacks were first & near the top of their list fe real.