After World War I ended, Eugene Jacques Bullard returned to Paris. He worked as a jazz drummer and nightclub owner, and as the tensions that led to World War II loomed, as an intelligence agent for France.
Research:

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 2
37:10

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 1
34:05

SYMHC Classics: Swill Milk
39:22