What are the signs that the government knows about intelligent alien life? It's not the obvious ones, like the existence of Area 51 or the Roswell story, The signs are more subtle but harder for the purveyors of the coverup to refute.
There are eight reasons, most having to do with public policy concerning the space program, that suggest that the government is aware of alien life and is refusing to acknowledge it. These consist of decisions and mysterious events that have hobbled the U.S. space program, thus ensuring that the aliens would not be encountered by human explorers.
None of the following constitutes proof of anything. But proof is not necessary for a good, entertaining conspiracy theory.
Reason One: We stopped going to the moon
The only sensible explanation for this is that the Apollo astronauts found something on the moon that motivated policymakers to stop lunar exploration.
Reason Two: The face on Mars
NASA's official line is the face on Mars is a trick of light and shadow. Subsequent images seem to prove that. On the other hand, isn't that what they would say to conceal evidence of alien life?
Reason Three: We have not been back to the moon
Two Republican presidents named Bush wanted to start exploring space again, with the Space Exploration Initiative and the Vision for Space Exploration. Two Democratic presidents ended those efforts in an obvious attempt to keep the existence of aliens secret.
Reason Four: The Defunding of SETI
In 1993, Congress cut off government funding for SETI, the Search for Extra Terrestrial Intelligence. More proof of a coverup.
Reason Five: The Challenger and Columbia shuttle disasters
In January, 1986, the space shuttle Challenger exploded over the Kennedy Space Center. In February, 2003, the space shuttle Columbia broke apart over the skies over Texas. Accidents? Or something else?
Reason Six: Cancellation of the Orion nuclear bomb ship program
In the late 1950s, Project Orion was designed to build huge spacecraft, propelled by the explosions on nuclear bombs, which would have opened the Solar System for human exploration. Naturally the project was cancelled in the early 1960s.
Reason Seven: The assassination of President Kennedy
President John F. Kennedy challenged America to go to the moon. While theories about his assassination abound, clearly a plausible notion was that he was killed to stop the Apollo project. Curiously, the assassination had the opposite effect, spurring on the moon landing program as part of a martyred president's legacy.
Reason Eight: The cancellation of Star Trek
The first Star Trek series depicted humanity as living among the stars, interacting with aliens. Clearly this was not a future that needed to be depicted to the public in the late 1960s if the existence of real aliens needs concealing.