In fiction, if one assumes there is a secret organization dedicated to studying, securing and covering - up signs of extraterrestrial intelligent life, and then an actual public First Contact occurs, would anything be revealed? And, what would change for any such organization?

Basically, I would like to ask you the question above. To elbaorate: there is the typical scenario of a secret, government or otherwise, organization that knows that intelligent extraterrestrial life exists and visits Earth. They are studying it, collecting all evdence and cover it up. NMaybe they make some (ehtical or not) experiments on them anjd try to use their technology to advance humanty's. Maybe they try to prepare the humans to defend against aliens.

And then, an actual first cotnact happens. In public. In such a way that either cannot be convered - up, or, for some reason, it is decided not to cover it up., From this moment on, knowladge that sentient aliens exist is public knowladge. and assume it was peaceful (that is, no open hostilities). Maybe humans begin to trade with the aliens. Some aliens may begin to come to Earth to visit.

Would said organization reveal anything then? And also, how would their operations change in such a situation? Stories with such secret organziaitons rarely take place during or post - public First Contact. What do you think about that?