Hamas is a multi-headed movement whose power centers and modalities of influence were shaped and institutionalized by changing realities. Its power centers and decision-making apparatus moved from the Gaza Strip to the control of the Hamas political bureau abroad, following Israel’s pursuit of the movement’s heads and activists in the territories, and the leadership vacuum that was created as a result.
The internal power struggles that waged within the movement secured and institutionalized Hamas’ current well-known structure: the Gaza Strip leadership, the West Bank leadership, the leadership of the prisoners in Israeli prisons and also, over the years, Hamas' military wing in Gaza. The military wing has developed into an almost autonomous entity that makes crucial decisions on its own.