How many movies have Giancarlo Ferrando and Lia Tanzi collaborated on?

They have worked on 4 movies together! Their first movie together was The Violent Professionals (1973) while their highest rated movie together was The Suspicious Death of a Minor (1975). They have not worked together since The Virgo, the Taurus and the Capricorn (1977). They are most known for their comedy films together.