He was born to a Rovigo peasant family soon before Italy entered World War I. Chilanti moved to Rome as a teenager to study agronomy and from 1934 took up employment as a writer for the farming union’s in-house journal.
He was soon drawn to the Fascist Left by Giuseppe Bottai and Edmondo Rossoni who were syndicalists who viewed Fascism as a social revolution against capitalism.
[1] Chilanti wrote an October 1939 article in Benito Mussolini's Gerarchia welcoming the Hitler-Stalin pact as heralding the future collaboration of the Soviet and Fascist régimes.
While seeking to advance such radical policies he formed a group around the newspaper Ventuno Domani, whose collaborators included novelist Vasco Pratolini.
[3][4][5] Chilanti and his ally, Vittorio Ambrosini, mounted one of the most militant of all Left-Fascist projects when they attempted to eliminate the foreign minister Galeazzo Ciano, whom the plotters saw as a conservative brake on the regime.