In 1945, Corso arranged for the safe passage of 10,000 Jewish World War II refugees out of Rome to the British Mandate of Palestine.

He was the personal emissary to Giovanni Battista Montini at the Vatican, later Pope Paul VI, during the period when the "Nazi Rat Lines" were most active.

At later hearings in 1992 of the Senate Select Committee on POW/MIA Affairs, Corso testified that he believed hundreds of American POWs were abandoned at these camps.

Corso says a covert government group was assembled under the leadership of Adm. Roscoe H. Hillenkoetter, the first director of Central Intelligence (see Majestic 12).

According to Corso, the reverse engineering of these artifacts indirectly led to the development of accelerated particle beam devices, fiber optics, lasers, integrated circuit chips and Kevlar material.