After the armistice of September 8 and the German occupation of Rome he was a member of the underground Comitato di Liberazione Nazionale (the political organization of the Italian Resistance) and, after the liberation of the Italian Capital on June 4, 1944, he became Minister in the antifascist Bonomi government.
The PLI-Congress at the end of 1947 signed a complete split between the Carandini-led left and the majoritarian right of the PLI.