Pasquale Prunas has only one other IMDB entry for a documentary about Mussolini called Blood on the Balcony. However, the writer, Gian Carlo Fusco, would work on several mondos like Realities Around the World and Naked World.
This movie was part of American-International TV’s “Real Life Adventures” syndicated TV package that was offered in 1966. It’s a mondo, but much tamer than any you will encounter. The highlight — other than men toiling in the sulfur mines and the night clubs of the time — is probably a trip to the Venice Film Festival, which looks as if it were shot as a home movie.