Declassified: The CIA "Oswald" and Mexico City

[Tom Scully]

How would an ESSO Havana exec. know how to recognize people who were associated with LHO?

Castro's biggest concerned was oil until he established a relationship with Venezuela, Castro infiltrated and paid informants to infiltrate these companies as well as three letter agencies.

If you read the newspaper article images displayed at the linked page, this exec. Barnes definitely was not paid
by or an agent of Castro, and Barnes gave the FBI his Coral Gables office address. It was the same address JM/Wave
had occupied. :

The Castro Obsession: U.S. Covert Operations Against Cuba, ...

https://books.google.com/books?id=PFYLAAAAYAAJ
Don Bohning - 2005 - ‎Snippet view - ‎More editions
6 While JMWAVE was by far the biggest, it was not the first CIA presence in Miami. ... Gleichauf opened an overt CIA office at 299 Alhambra Circle, a well- known, east-west street in Coral Gables, an upscale area abutting Miami on the south, ...