Cryptonym: AMFOX-1
AMFOX-1 is "Montes".
3/27/61 memo is signed by "Monty", with a circle around his name is "201-281397". Marginalia next to his name is "Agent 2637" (also known as AMPANIC-7/Emilio Adolfo Rivero Caro), as well as AMBRONC-5/Juan Manuel Guillot Castelloro.
104-10506-10024: JUAN FALCON TAMAR
Juan Falcon aka Esteban was national coordinator of the MRR from May 1961 until his capture with 35 men in May 1962. 201-281397. On July 18, 1962 Falcon was interviewed on CMQ Television by REVOLUCION director Carlos Franqui, EL MUNDO director Luis Gomez Wanguemert, and HOY assistant director Raul Valdes Vivo. Six pages earlier, a 7/17/61 interview on Radio Rebelde is summarized. Juan Falcon Tamar was engaged in sabotage events: Burning the "petroquimica" of Cotorro; a plan to destroy national transport in general; destruction of three buses on Rt. 33; a plan to poison cattle; destroy other aspects of economy; assassinate Carlos Rafael Rodriguez; plan to assassinate Castro. Claimed to have CIA support.
In 1967, it looks like Juan Falcon Tamar has changed his name to "Jose Matar" and remains as AMFOX-1 with a new bio number of 201-058654. This means that Juan Falcon was a double agent working for Castro throughout his stint with the MRR.
104-10301-10001 EXCERPTS FROM HISTORY: WESTERN HEMISPHERE DIVISION, 1946-1965
In 1975, David Phillips wrote that AMFOX-1 was a CIA agent who WH Division thought might have been doubled.
Brian Latell, Castro's Secrets, page 10.
CIA officer, Brian Latell, cites Phillips' history to say that AMFOX-1 was a double, and adds that he was recruited as a stay-behind agent before the American embassy closed in Jan. 1961 and that he reported for a dozen years before he was outed in 1973.