Returning to Florence, he came into contact with the literary environment that animated Solaria (the European magazine, which existed from 1926 to 1936), who was a collaborator and director, publishing military narrative (1927) The loving servant (1929) and the whims of 'Adriana (1934), republished in distant Racconti 1962, texts of the past that have to do with a distant social history.

In 1937 Bonsanti founded and assumed the direction of publishing at a magazine that collected the inheritance of Solaria.

This was a prestigious assignment that Bonsanti held with great willingness and firmness, making for almost forty years an untiring promoter of various cultural initiatives.

The following year he assumed the position of Director of Il Mondo, which he himself founded with Eugenio Montale and Arturo Loria.

In recent years Bonsanti's interests were also addressed to active politics; in this period he was approaching the Republican Party of Spadolini and in 1983 was elected mayor of Florence, head of a pentapartito junta, which was not completed due to his death in 1984.