MJ-12

In UFO conspiracy theories, Majestic 12 (or MJ-12) is the code name of an alleged secret committee of scientists, military leaders, and government officials, formed in 1947 by an executive order by U.S. President Harry S. Truman to facilitate recovery and investigation of alien spacecraft. The concept originated in a series of supposedly leaked secret government documents first circulated by ufologists in 1984. Upon examination, the Federal Bureau of Investigation (FBI) declared the documents to be "completely bogus", and many ufologists consider them to be an elaborate hoax. Majestic 12 remains popular among some UFO conspiracy theorists and the concept has appeared in popular culture including television, film and literature.

The concept of "Majestic Twelve" emerged during a period in the 1980s when ufologists believed there had been a cover-up of the Roswell UFO incident and speculated some secretive upper tier of the United States government was responsible. Their suppositions appeared to be confirmed in 1984 when ufologist Jaime Shandera received an envelope containing film which, when developed, showed images of eight pages of documents that appeared to be briefing papers describing "Operation Majestic Twelve". The documents purported to reveal a secret committee of twelve, supposedly authorized by United States President Harry S. Truman in 1952, and explain how the crash of an alien spacecraft at Roswell in 1947 had been concealed, how the recovered alien technology could be exploited, and how the United States should engage with extraterrestrial life in the future.

Shandera and his ufologist colleagues Stanton T. Friedman and Bill Moore say they later received a series of anonymous messages that led them to find what has been called the "Cutler/Twining memo" in 1985 while searching declassified files in the National Archives. Purporting to be written by President Eisenhower's assistant Robert Cutler to General Nathan F. Twining and containing a reference to Majestic 12, the memo is widely held to be a forgery, likely planted as part of a hoax. Historian Robert Goldberg wrote that the ufologists came to believe the story despite the documents being "obviously planted to bolster the legitimacy of the briefing papers".

...
Wikipedia