msycamore said:

Thanks for the explanation Leo, but why did they type it like this on the opening titles then?

" FUGGI' "

Maybe it's just a font variation? The original Italian poster have another style of it. That's why I was a little confused about it.

Short explanation: it's an error.

Slightly longer explanation, partly made of guesswork:

It's an error carried over from decades of people using typewriters, which didn't have many symbols. As a matter of fact, some typewriters didn't even have the number 1, so it was substituted by I.