These ideas were suited for making alliances with more moderate centre-left parties, such as the Italian Socialist Party (PSI) and the Italian Democratic Socialist Party (PSDI); both the PSI and PSDI were member parties of the Organic centre-left (the first centre-left government in the history of the Italian Republic) led by Aldo Moro and Christian Democracy (DC) in the 1960s, to which the PCI at times gave external support. Consequently, migliorismo received extensive derogatory treatment from the revolutionary left-wing of the PCI, which was led by Ingrao.
These ideas were appropriate for forming alliances with more moderate center-left parties, such as the Italian Socialist Party (PSI) and the Italian Democratic Socialist Party (PSDI); both the PSI and PSDI were member parties of the Organic center-left (the first center-left government in the history of the Italian Republic) led by Aldo Moro and Christian Democracy (DC) in the 1960s, to which the PCI at times provided external support. Consequently, migliorismo received significant negative criticism from the revolutionary left-wing of the PCI, which was directed by Ingrao.