The pellagra epidemic of the early 20th century may have been the deadliest epidemic of a specific nutrient deficiency in U.S. history. Part one covers what it is, its appearance in 19th-century Italy, and the first reports of it in the U.S.
Research:

SYMHC Classics: COINTELPRO 1
39:12

Behind the Scenes Minis: It's Not Unprecedented
16:46

The Rendition of Anthony Burns, Part 2
43:32