The 1950 FBI Memo on Flying Saucers: A Cautionary Case Study in Intelligence Reporting

To the point

J. Edgar Hoover and Guy Hottel illustrate that dramatic UFO claims are unreliable, since the informant was anonymous, no one verified the story, and modern intelligence clearly states confidence levels to separate rumors from evidence.

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What the FBIs UFO Memo Shows About American Intelligence
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What the FBIs UFO Memo Shows About American Intelligence

In 1950, the FBI told J. Edgar Hoover that it heard about three flying saucers downed in New Mexico. Then it accidentally provided a case study in how to spot a bogus intelligence report.