Ciao, Professore! (1992) on Netflix

Marco Sperelli is a teacher, he is divorced and he is sent to work in Corzano, a town near Naples. The first day of work he finds in the school only the school-caretaker and few girls and boys in the class-room. He goes out looking for them and he discovers then a wretched life led by the boys and the girls of Corzano. A life in which only power and violence are worth respecting. Sperelli tries to teach something different but he gets their respect only by slapping Raffaele, on the way to became a camorrist. His presence and his work, however, disturb too many persons and he will be transferred.