There are a lot of people and organizations putting pressure on the American government and other powers to reveal the truth about UFOs. You can link up with any of the following organizations to help.
Attend an Exopolitics Conference and Get to Know More about the Political Implications of the Extra-terrestrial Presence - You can expose UFO government policies by getting familiar with exopolitics – the study of key political “actors, institutions and processes associated with extraterrestrial life.” The Exopolitics Institute is an educational organization that releases scholarly publications on the ET phenomena and also puts on international exopolitics conferences. You can get involved with them to start putting pressure on the U.S. government.
Get Involved with the Paradigm Research Group - Paradigm Research Group “provides support to researchers and political activists throughout the world in the field of extraterrestrial-related phenomena research.” It “was established in early 1996 by Stephen Bassett, a political activist and consultant, to advocate in all ways possible for an end to a government imposed truth embargo of the facts surrounding an extraterrestrial presence engaging the human race.”