Streets of Heaven. The city of Chicago is finally tearing down some of its notorious housing projects - communities that have come to symbolise all that is wrong with modem inner cities. But will the culture of poverty, crime and despair crumble with the bricks and mortar? And who is to blame for the situation? Professor Henry Louis Gates enters some of Chicago's poorest black neighbourhoods to investigate. Director Mary Crisp ; Series producer Simon Chinn (S) (W)