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Question: Why would the, as you suggest they were, KGB agents Ruth and Marina type this letter? I thought Oswald was working for the KGB too? Did they frame a fellow agent?
Steve,
I have already shown that triple-agents Aleksei Kulak and Ivan Obyedkov (misspelled "Byetkov" in Angleton's June 19, 1975 Church Committee testimony) planted a Kremlin-protecting and ultimately Angleton-damaging "WW III virus" in Oswald's CIA file.
How?
By the former's making KGB officer Valiery Kostikov's name "radioactive," and the latter's "volunteering" said radioactive name to an Oswald impostor over a sure-to-be-tapped Soviet Embassy phone line on 10/01/63.
The "Kostin letter" can be reasonably construed as a clever supplement to the above-mentioned stategim.
-- Mudd Wrassler Tommy