The part where a question was asked whether why the employees of such covert operations would not leak information out, it's because most of them since childhood have been indoctrinated and or mindcontrolled into serving the system.
Using Mk-Ultra mindcontrol for example the victims are being selected since childhood. Programming include being traumatised. (Electro shocked and sexually abused) Once the victim gets traumatised they create amnesia walls and mind splits into two (DID or DPD) . Now the mind which carries the trauma will carry all the secret information while the other mind is safe from all these bad memories will operate just like a normal person. So now we have a person who has information but he cannot leak out that information unless his/her master mentions a certain code word that's the only way the info. Inside their mind can get extracted. Like personal computers for example.
See how they do it here : http://wp.me/p8jkyz-O
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