There are billionaires and space entrepreneurs like Robert Bigelow who have gathered enough evidence to prove the existence of aliens.
As far as Galaxy Federations are concerned, there are different views on this subject, from Asimov's "Foundation", Ron Hubbard's "Galaxy Confederacy", George Lucas "Old Republic" and "Empire" to Gene Roddenberry's "United Federation of Planets".
These are old memories from past lives surfacing and coming together as sci/fi stories.
There's good and evil, truth and lies in all organizations whether galactic or terrestrial. The truth isn't handed to us on a silver platter.
We are challenged to find out the whole truth of where we are coming from and where we are going.
We have to rip the veil off the half lies and deception from the powers that be.