Tom,
Ironically, The Mitrokhin Archive is much more likely to be an elaborate KGB/FSB deception than a CIA one, But alas, you'd have to read Bagley's "Spy Wars" to know what I'm talking about ...
Regarding your Scribd author's or JFK researcher's or government funtionary's third-person
description of Angleton's June 19, 1975, Church Committee testimony, if you'd look at the original transcript (see below), you'd see that somebody hand-wrote a "?" above the name Byetkov, indicating that no one by that name was known to the powers-that-be, which in-an-of-itself suggests that the name was probably mis-spelled by the stenographer/court reporter/transcriber. (Interestingly, this poor soul had a terrible time spelling Nikolai Leonov's name and some other Russian names correctly throughout the transcript.) Since Angleton suggests in this testimony (and goes into much greater detail for five or six pages in his February 9, 1976, testimony -- in which he refers to this triple-agent as "another hangnail" without mentioning his name), that this person was a triple agent in Mexico City, and that he was probably feeding disinformation to the CIA from Kostikov, it makes sense that "Byetkov*?" was non other than the Soviet Embassy security guard, Ivan Obyedkov (pronounced ahh-bee-ED-cough), who "volunteered" the radioactive (Department 13!) name "Kostikov" to Oswald, or, more likely, to Oswald's (KGB? DGI?) impersonator, over the surely-known-to-be-tapped Sov Emb phone on 10/01/63, thereby effectively planting the Kremlin-coveringup WW III Virus in Oswald's CIA file.
https://www.maryferrell.org/showDoc.html?docId=1447&search=Angleton#relPageId=16&tab=pagePS: Bill Simpich agrees with me that this triple-agent "Byetkov*?" must me Obyedkov.
...
A personal note, now, Tom --
Tom, I've always found your "research" to be very tenuous, very thought-associative, very laboured, very scattered, very exhausting, very obsessive, very tendentious, very seven-degrees-of-separationish, very boring, and, yes, even very ...... aww ... never mind.
Suffice it to say that I will engage you no further here, or anywhere else.
(I don't want to encourage or enable your obviously very serious ... aww ... never mind.)
-- Tommy