Milani coordinated the production of *Letter to a Teacher* (*Lettera a una professoressa*), which denounced the inequalities of a class-based educational system that advantaged the children of the rich over those of the poor. It was composed by eight boys from the school of Barbiana, according to the "group writing" method inspired by the cooperative writing method promoted by Mario Lodi and influenced by Celesine Freinet. Lodi visited Barbiana and his students engaged in exchanges with those at Barbiana. It has been translated into about forty languages. It introduces many of the themes that became prominent in the later development of the Sociology of Education. The text served as a manifesto for the 68 movement, serving as an indictment of not only the Italian schooling system but Italian society at large. (Source: [Wikipedia](https://en.wikipedia.org/wiki/Lorenzo_Milani))