Lost Youth(1948)

Original title: Gioventù perduta

In impoverished post-war Rome, a gang of young thieves is lead by Stefano, the son of an illustrious professor. The police suspects that the criminals are actually university students; inspector Mariani, a young World War II veteran, enrolls and tries to find out more. He falls for a pretty fellow student, Luisa, but she is the sister of the gang leader...