I worked with an ex-Mormon guy for about a year or so who was an ex-CIA contractor. He said there are a lot Mormons in the CIA as well and they called it the "Mormon Mafia" (mostly in a joking manner).
So when he'd meet new people within the CIA who were Mormon they would sometimes ask him, "Mormon Mafia?", if they suspected he was Mormon.
This guy did his mission in Russia and speaks Russian... so there you go. He had some crazy stories about doing mission work in Russia. He was almost killed several times.
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