Cry, the Beloved Country (1951)

In the back country of South Africa, black minister Stephen Kumalo (Canada Lee) journeys to the city to search for his missing son, only to find his people living in squalor and his son a criminal. Reverend Misimangu (Sidney Poitier) is a young South African clergyman who helps find his missing son-turned-thief and sister-turned-prostitute in the slums of Johannesburg.imdb