The Criterion website describes Federico Fellini's I Vitelloni as "semi-autobiographical" which is a valid description of any Fellini film. The man couldn't make a movie that wasn't ultimately about himself. I suppose upon its release in 1953, with only two other films under his belt, it is perhaps the most autobiographical Fellini has been thus far, but both earlier films clearly have elements of Fellini's life woven in. As far as I Vitelloni goes, it's pretty clear who Fellini thinks his author-insert is, but it's also pretty clear which who it actually is.