There are many in ‘power’ who have kept secrets from us.

Other life forms have been suppressed, killed, treaties never honored. They cannot even honor treaties between humans.

https://www.nsa.gov/news-features/declassified-documents/ufo/

https://www.loc.gov/collections/finding-our-place-in-the-cosmos-with-carl-sagan/articles-and-essays/life-on-other-worlds/ufos-and-aliens-among-us