Why was the Tuskegee Syphilis Experiment allowed to go on for 40 years and no one raised a stink about it ?

For forty years between 1932 and 1972, the U.S. Public Health Service (PHS) conducted an experiment on 399 BLACK MEN in the late stages of syphilis. These men, for the most part illiterate sharecroppers from one of the poorest counties in Alabama, were never told what disease they were suffering from or of its seriousness. Informed that they were being treated for “bad blood,” their doctors had no intention of curing them of syphilis at all.