Thrilling forum

La pretora (1976) as Restaurant customer

Il furto della Gioconda (1977 TV mini-series) Episode 3, as Art expert confirming the authenticity of the Mona Lisa.

This is currently Aldo's last known role.

Una forca per un bastardo (1968) as Rod, Undertaker in a credited role

Lo sgarbo (1974), credited as Aldo Bonanno

Colpo sensazionale al servizio del Sifar (1968) as The general.

Aldo doesn't appear in the more commonly seen 82 minute Italian version, but the English-dubbed version titled Crime Story includes an additional scene featuring Aldo as a stern bad guy boss giving out orders. Unfortunately, this version is currently only available through a horrendous-looking VHS-rip.

Afyon oppio (1972) as Mob boss

Gli esecutori (1976), as Mafia member
Pics by Cinema Italiano

Macrò - Giuda uccide il venerdì (1974) as Margherita's customer on the phone (uncredited)

A mezzanotte va la ronda del piacere (1975) as Spectator at the trial

The Shoes of the Fisherman (1968)

He appears quite prominantly throughout the film, but he never speaks or is spoken to, so it's hard to know exactly how to describe his role. He seems to serve as some sort of overseer of events in the Vatican, so I'm going with the role as being that of Papal aide.