The Third Bonomi government established the Ministry of Occupied Italy with Decree Number 395 of 12 December 1944 to coordinate Italian government relations with the CLNAI and the CVL, as well as to provide assistance to the population of northern Italy living under German occupation and Italian fascist control.

The war ended in Europe on 8 May 1945, and on 21 June 1945 Lieutenancy Decree Number 380 established the new Ministry for Post-War Assistance (Italian: Ministero dell'assistenza postbellica).

As minister, he found an opportunity to strengthen the positions of Italian communists in the northern regions of Italy.

By ministerial decree of 26 February 1945, he was appointed President of the Central Commission for the Investigation of Atrocities Committed by the Germans and Fascists After 25 July 1943 (Italian: Commissione Centrale per l’accertamento delle atrocità commesse dai tedeschi e dai fascisti dopo il 25 luglio 1943).

The ministry also oversaw the production of Giorni di gloria ("Days of Glory"), a 1945 propaganda film about the Italian resistance movement.