Here is one for free because it appears that everyone else has forgotten.
The alleged Roswell UFO crash in 1947 and evidence from it was exposed as a fake story in the early 1950s. Journalist Frank Scully let's see what Wikipedia has to say about him:
"....publicized the Aztec, New Mexico UFO hoax when, in 1949, he authored two columns in Variety claiming that dead extraterrestrial beings were recovered from a flying saucer crash. Scully's 1950 book Behind the Flying Saucers expanded on the themes of flying saucer crashes and dead extraterrestrials, with Scully describing one of his sources as having "more degrees than a thermometer." In 1952 and 1956, True magazine published articles by San Francisco Chronicle reporter John Philip Cahn that purported to expose Scully's sources as con artists who had hoaxed Scully. Scully's 1963 book In Armour Bright also included material about alleged flying saucer crashes and dead extraterrestrials.
The Aztec crash was a hoax. The Roswell crash was a hoax based on actual finds (you can argue about that). But Scully's super "more degrees than a thermometer" source was someone in intelligence. Spinning out fakery to distract and subvert Ufology in its early days.
The whole crashed UFOs story was discredited and only the odd conspiracy person even mentioned UFO crashed into the 1970s.
Charles Berlitz brought the whole thing back into the open with the book The Roswell Incident (1982). Who was Berlitz's co-author who, when I briefly met Berlitz in London back in the 1980s, told me had the Roswell information leaked by a U.S. Intelligence officer? Oh...William Moore the Ufologist who had to admit (he was about to be exposed) that he had spied on Ufologists, reported on their activities and even fed false information to his 'friends' (but would not identify the others he worked with -I have two names unconfirmed). My late colleague Frankly A. Davin-Wilson met Leonard Stringfield the veteran Ufologist at a 1980s BUFORA conference and talked to him about his work on crash-retrievals. He was told (without naming names) that the information Stringfield had from former military personnel could not be challenged as it came from a man in the Air force Office of Special Investigations (AFOSI).
Richard Doty was handling Moore as well as doing dirty work on Paul Bennewitz and it is highly likely that Stringfield got information from Doty -that has already been discussed in certain UFO circles. I doubt Doty was Scully's sources but it goes to show that from the 1950s right up to date U.S. intelligence has used, deceived and now basically controls the UFO believers -remember the CIA infiltrated NICAP in the 1960s and destroyed it.
People: if I say I do not believe Elizondo (who is an awful actor and has admitted that he was asked to put his skills together and deal with Ufology -that he had no interest in) that is my opinion based on facts that have been uncovered. I do not even read the comments on Twitter over that.
CHECK THE FACTS
DO NOT BE DECEIVED