[1] Filippo De Nobili studied law at the Sapienza University of Rome, where he met and became the disciple of the Marxist philosopher Antonio Labriola.
However, in July 1896, he was expelled from the university for leading a student's agitation, following the replacement of the Minister of Education Guido Baccelli, a left-wing politician, by Emanuele Gianturco, a moderate catholic.
The Marxist philosopher Antonio Labriola tried to protect the students but a final verdict confirmed the expulsion of the three leaders, with the prohibition of attending any Italian university for two years.
In August 1942, under fascism, Filippo De Nobili and Francesco Maruca clandestinely founded the Communist Federation of the Province of Catanzaro.
Disciple of the Marxist philosopher Antonio Labriola, he was also a close friend of the socialist Mario Casalinuovo and of the communist statesman Fausto Gullo.