Ummo affair.
discreditedanomaly_regionSpanish Air Force MoD declassification
The Ummo affair was an elaborate hoax running from the 1960s-70s in Spain (and beyond) in which numerous people received typed letters purportedly from extraterrestrials from a planet called "Ummo,"…
The Ummo affair was an elaborate hoax running from the 1960s-70s in Spain (and beyond) in which numerous people received typed letters purportedly from extraterrestrials from a planet called "Ummo," complete with a distinctive symbol. Spanish parapsychologist José Luis Jordán Peña later claimed he authored the letters. It is regarded as a classic constructed hoax, notable for its scale and influence on European ufology.