 We learned of the May 18th death of Peter Buxton. He was the whistleblower who revealed that the federal government allowed hundreds of black men in rural Alabama to go untreated for syphilis from the 30s into the 70s. Buxton led to the study's end in 1972, a hero to public health scholars and ethicists. Buxton died in California at the age of 86. I'm Richard Cantu, ABC News.