'Milano Calibro 9', directed by Fernando Di Leo, is the first installment of his milieu trilogy, showcasing the ideological battles between the right and left in early 1970s Italy. The movie offers more than just a portrayal of the gritty Milanese underworld; it dives into the moral and political tensions exemplified in the police precinct between a right-leaning commissioner, played by Frank Wolff, and a left-leaning deputy commissioner, portrayed by Luigi Pistilli. Through their dialogues, the film raises pertinent questions about social justice and class struggle, illustrating the complex dynamics between power, class, and morality.

As the story unfolds, the character of Mercuri, the deputy commissioner, often expresses sentiments that resonate with the working class and marginalized groups, highlighting the failures of law enforcement to protect the vulnerable. His character's passionate arguments about the injustice faced by the poor serve as a stark contrast to the more conservative views held by his superior. This dynamic not only adds depth to the narrative but also reflects the larger societal conflicts of the time, making the film a historical commentary on post-war Italy's socio-political landscape.

The film's release on RaiPlay serves to revive interest in this classic work and encourages new generations to engage with its themes of political division and social inequity. Given its availability, 'Milano Calibro 9' is positioned as not only an entertainment piece but also as an educational resource, allowing viewers to connect historical narratives to contemporary discussions surrounding justice and class in Italy.