As the art biennial opens, the smell of violence once again lies in the air in Istanbul. Can a major exhibition respond to the language of the street and fulfil its promise of a free and modern society? By Catrin LorchMore
They are descendants of Africans brought to the Ottoman Empire as slaves and domestic workers and said to number up to 100,000. Bradley Secker spent time with those identifying as Afro-Turks in western Turkey.