The document reveals that a FBI informant named Guy Hottel, filed a sworn memorandum that an ET craft and alien bodies were recovered from Roswell and that "three so-called flying saucers had been recovered in New Mexico."
You can understand why the FBI is so upset this memo became popular, if true it verifies the most important event in mankind to date - the Roswell incident!
Its come to light only now that the FBI (officially) now never followed up on the most popular file in its online reading room . A reply from the FBI denied that the memo constituted evidence for the existence of extraterrestrial spacecraft — and said Hottel's report was never taken all that seriously as noted on the commentary along side the memo:
"Finally, the Hottel memo does not prove the existence of UFOs; it is simply a second- or third-hand claim that we never investigated. Some people believe the memo repeats a hoax that was circulating at that time, but the Bureau's files have no information to verify that theory. Sorry, no smoking gun on UFOs. The mystery remains."
The Link to the memo (below) from FBI informant Guy Hottel :