He later became a notable member of the Italian Communist Party (PCI), part of which in 1991 gave origin to the Democratic Party of the Left (PDS), and in 1998 to the Democrats of the Left (DS).
Kasnije je postao istaknuti član talijanske Komunističke partije (PCI), u sklopu koje je 1991. godine dao povoda Stranki demokratske ljevice (PDS), a 1998. i Demokratima lijevice (DS).