See comments about Oswald doubles in Dallas and a fake in Mexico according to the FBI
(6) Telephone conversation between Lyndon B. Johnson and J. Edgar Hoover (23rd November, 1963)
J. Edgar Hoover: I just want to let you know of a development which I think is very important in connection with this case. This man in Dallas (Lee Harvey Oswald). We, of course, charged him with the murder of the President. The evidence that they have at the present time is not very strong.... We have the gun and we have the bullet. There was only one and that was found on the stretcher that the President was on...
Lyndon B. Johnson: Have you established any more about the visit to the Soviet Embassy in Mexico in September?
J. Edgar Hoover: No, that's one angle that is very confusing. We have up here the tape and this photograph of the man who was at this Soviet Embassy, using Oswald's name. That picture and the tape do not correspond to this man's voice, nor to his appearance. In other words, it appears that there is a second person who was at the Soviet Embassy down there.
Col Prouty had a very different view see the video @1 hour 28 minutes
https://m.youtube.com/watch?v=smSkwg8Tag4&feature=youtu.be
Also see primary sources
https://spartacus-educational.com/JFKSoswald.htm
See comments about Oswald doubles in Dallas and a fake in Mexico according to the FBI
(6) Telephone conversation between Lyndon B. Johnson and J. Edgar Hoover (23rd November, 1963) J. Edgar Hoover: I just want to let you know of a development which I think is very important in connection with this case. This man in Dallas (Lee Harvey Oswald). We, of course, charged him with the murder of the President. The evidence that they have at the present time is not very strong.... We have the gun and we have the bullet. There was only one and that was found on the stretcher that the President was on...
Lyndon B. Johnson: Have you established any more about the visit to the Soviet Embassy in Mexico in September?
J. Edgar Hoover: No, that's one angle that is very confusing. We have up here the tape and this photograph of the man who was at this Soviet Embassy, using Oswald's name. That picture and the tape do not correspond to this man's voice, nor to his appearance. In other words, it appears that there is a second person who was at the Soviet Embassy down there.
https://spartacus-educational.com/USAfbi.htm