The Tuskegee syphilis experiment(also known as the Tuskegee syphilis study or Public Health Service syphilis study) was a clinical study conducted between 1932 and 1972 in Tuskegee, Alabama, by the U.S. Public Health Service. Investigators recruited 399 impoverished African-American sharecroppers with syphilis for research related to the natural progression of the untreated disease, in hopes of justifying treatment programs for blacks.