In 1826, William Morgan, who lived in Batavia, New York, advertised that he was writing a book that would expose the secrets of the Freemasons. And then he vanished.
Research:

Robert Moses and the Shaping of New York, Part 2
42:12

Robert Moses and the Shaping of New York, Part 1
41:59

SYMHC Classics: Eradication of Smallpox
43:25