The notorious Rio de Janeiro slum known as "The City of God," is a place most self-respecting Brazilians would prefer to avoid. But it is now the subject of a film that focuses on drug-dealing. It has been nominated for four Academy Awards, including best director. For the film, co-director Katia Lund recruited a number of young men from the slum and trained them as actors. NPR's Martin Kaste reports.