The same thing Pfizer was hiding when they wanted courts to seal their vaccine test data for 75 years…the truth. Seth Rich leaked all the Democrats data to WL. They found out and had him murdered. The FBI covered it up and very likely helped set up the hit to begin with. It would be awkward if anyone found out. 66 years gives all the agents involved enough time to die of old age, their spouses wouldn’t be around anymore. Even their children would be elderly or passed away. The one thing they fear most - accountability.