From an earlier reply...How did/could he possibly know that? Unless..there was indeed an imposter gallivanting around posing as Oswald.
The memo was sent to "his own small band of loyal agents"
No doubt Jane Edna Hoover played footsie with whoever had the drop on him...organized crime/mob/mafia whatever... He knew Kennedy was going to retire him.
Oh don't forget... https://en.wikipedia.org/wiki/Allegations_of_CIA_drug_trafficking
Everybody wanted Havana back for their own personal playground.
Everybody wanted Havana back for their own personal playground.The Mob wanted Havana.... HL Hunt wanted Cuban oil and sugar production .... (Incidentally HL Hunt and J.Edgar Hoover were close personal friends.... If Hoover needed financing for a project ( like paying a hit man to kill Marilyn Monroe) ) HL Hunt just dipped into his pocket and forked over the funds.
Notice that this memo was written about 3:01 CST 11 /22/63 ......And Hoover already has the story (Lies) created. Lee had been arrested about an hour earlier.
https://www.maryferrell.org/showDoc.html?docId=62251#relPageId=96&tab=Notice that Hoover says that Lee went to Cuba on several occasions but he wouldn't tell the FBI why he went to Cuba.
Amazing!!... WHEN would Lee have gone to Cuba on several occasions??? This document ( hoover memo) is astounding...What a pack of lies!!