[1] He was the second son of Giacomo Matteotti and had an older brother, Giancarlo, and a younger sister, Isabella.

[2][3] After 8 September 1943 Matteotti participated in the War of Liberation and was a militant of the Red Flag movement.

[2] He later joined the Italian Socialist Party (PSI) and served as its secretary, until 1946.

[2] Matteotti also held the same post in the subsequent cabinet headed by Mariano Rumor from 1973 to 1974.

[1] Like his father and his older brother Giancarlo (1918–2006) he was buried in Fratta Polesine.