We know a little bit that they didn't want us to know. The CIA wasn't as complete as possible with covering its tracks, and quite some independent research has

We know a little bit that they didn't want us to know. The CIA wasn't as complete as possible with covering its tracks, and quite some independent research has been done on the remaining evidence. The trouble is the CIA and other nefarious intelligence agencies have worked very hard to discredit this, clearly because they committed crimes against humanity in their work. However there is still a healthy segment of society that are critical of these criminal agencies. There is still a lot more to be revealed.