MI6 and SOE assisted in developing the office of Coordinator of Information (COI). a year before the creation of the OSS in 1942 under Roosevelt. OSS initially sourced Brit intelligence until American intelligence was able to satisfy needs. Later, after WWII, OSS evolved into C_A and other agencies.
Brits were involved long before CIA existed, but their influence is definitely there.
Roosevelt gave nuclear weapon technology to the Russians
that zionist/traitor kikesucker should have been hung from his testicles
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