ITALIAN SECRET ARMY (DEATH RAY) original document from italia secret service organization O.V.R.A.
In June of 1936 Marconi demonstrated to Italian Fascist dictator Benito Mussolini a wave gun device that could be used as a defensive weapon.

Benito Mussolini and Guglielmo Marconi.
ORIGINAL PHOTO MUSSOLINI and MARCONI
Mussolini was quite pleased with Marconi's invention. However, it is said that Pope Pius XI learned about the paralyzing rays and took steps to have Mussolini stop Marconi's research.
According to Marconi's followers, Marconi then, after faking his own death, took his yacht to South America in 1937.