Knowledge is power.
Secret knowledge is secret power.
Secret power is doubly effective as it works without anybody noticing!
(or so few as to ignore them)
Technocracy is based on secret knowledge.
eg, before cryptos, few people would have ever questioned the nature of money.
eg, most people remain deeply clueless about the damage done to them by synthetic pulsed electromagnetic signals.
Some knowledge is not just about who did what, where and when - some knowledge is about the nature of the universe. When that is hidden, the secret power can do almost anything to the ignorant masses.
Many such examples took place during and after World War II. One such story has been mystified into The Bell - a prototype antigravity UFO. The location is real, the research was real, the real research was deeply buried. But what was it?
Totally unsensational! just a guy looking for clues :-)
I mean... Nazi scientist becomes head of NASA and nobody blinked? But that's another story, though closely related.