 Chetnik ideology revolved around the notion of a Greater Serbia within the borders of Yugoslavia, to be created out of all territories in which Serbs were found, even if the numbers were small.This goal had long been the foundation of the movement for a Greater Serbia.During Axis occupation the notion of clearing or "ethnically cleansing" these territories was introduced largely in response to the massacres of Serbs by the Ustashe in the Independent State of Croatia.