Hamas has four constituencies — activists in Gaza, the West Bank and exile, and members imprisoned by Israel. Each of the four groups chooses local leaders as well as delegates to the group’s Shura Council.
Hamas elects convicted murderer Yahya Sinwar as Gaza chief – Dov Lieber – The Times of Israel 13.02.17
Jailed by Israel for killing collaborators, released in Shalit exchange, and included on US terrorism blacklist, Islamic terror group’s new strongman is seen as violent, unpredictable extremist.
How Hamas prisoners elect leaders behind bars – Adnan Abu Amer – Al-Monitor 13.02.17
Even locked in Israeli prisons, Hamas members contribute to the movement’s decision-making process by holding leadership elections every two years.
A Palestinian Mandela to be? July 5, 2016