[1] The document, known as "Il Manifesto dei 101", was conceived and initially drafted by philosopher Lucio Colletti and historians Luciano Cafagna and Francesco Sirugo, all three members of the Italian Communist Party (PCI).
[2] It was co-signed by 98 more intellectuals, among whom were historians Renzo De Felice and Alberto Caracciolo, and strongly endorsed by Antonio Giolitti, a leading personality and member of the Italian Parliament.
It was leaked to the press and provoked a brutal reaction by the party's leadership and the Direction Bureau; any debate attempt was rejected while the document's authors, labelled as "traitors", were threatened with heavy political consequences.
First worried by the public diffusion of the manifesto, then more seriously intimidated by the party leadership's reaction, a few of the signatories retracted their adhesion while others, who refused to do so, resigned.
Among the manifesto's promoters, some (Cafagna, De Felice, Sirugo, and Colletti) ended up, although at different stages, cutting ideological ties with communism.