Born in Imola as Argentina Bonetti, Altobelli joined a youth group while in Parma, led by Agostino Berenini, in support of the views of Giuseppe Mazzini.
[1][2] As leader of Federterra, Altobelli campaigned for land nationalisation, and set up employment offices and co-operatives for union members.
From 1912, she served on the Superior Labor Council at the Ministry of Agriculture and Commerce, and also became a director of the National Accident Fund.
[1][2] Altobelli was on the reformist wing of the PSI, and in 1922 joined the Unitary Socialist Party split.
[1][2] Federterra was banned in 1926, and Altobelli took jobs out of the public eye, campaigning for workers but facing increasing poverty.