This 2019 episode covers Benjamin Lay, a Quaker and a radical abolitionist who lived in the period between when the Religious Society of Friends began and when it started formally banning slave ownership among its members.

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