There are 3 faction leader roles. The Israeli Prime Minister, the Chairman of Hamas, and Chairman of the Palestinian Liberation Organization. The leaders alone know their win condition. Each leader has a night action that involves killing a citizen. Every citizen currently aligned with a faction leader wins when their leader wins.
Palestinians may align themselves freely between Hamas/PLO by announcing it during the day to share the faction's win condition, if they have been forced onto a faction this has no effect. All roles are known on day 1. Citizens are always a member of the latest faction they have been forced onto. The citizen chosen to attempt a kill knows which leader is asking them and their target and must accept or refuse during the same night. The death announcement on day start will only reveal alignment if they are a forced citizen of a faction.
Only one night kill can happen total. The faction with the lowest number of aligned members gets the highest priority, lowest forced members if it's a tie, cointoss if it's still a tie. Even though only 1 night action may happen all the leader requests are still sent to their chosen citizen.
Leader roles
Israeli Prime Minister
You are the Israeli Prime Minister. During the night you may attempt to kill one Palestinian citizen by selecting one Israeli citizen to carry out the task.
If your chosen citizen refuses then no kill happens and your Israeli citizen becomes a forced member of the faction you attempted to kill and learns their win condition.
Chairman of Hamas
You are the Chairman of Hamas. During the night you may attempt to kill any citizen of any faction by selecting one Palestinian citizen of any faction to carry out the task.
If your chosen citizen refuses then nothing happens.
If your chosen citizen accepts then they learn your win condition and become a forced member of Hamas.
Chairman of the Palestinian Liberation Organization
You are the Chairman of the Palestinian Liberation Organization. During the night you may attempt to kill any citizen of any faction by selecting any citizen to carry out the task and selecting a faction they would be forced to join on refusal.
If your chosen citizen refuses then they become a forced member of any faction you specified for their exile and learn their win condition.
If your chosen citizen accepts then they learn your win condition and become a forced member of the PLO.
Citizen roles
Israeli Citizen
You are an Israeli citizen. You win when the Israeli PM wins, if you have been forced onto a faction your new win condition is your faction leader's win condition.
Palestinian Citizen
You are a Palestinian citizen, you may announce your alignment with Hamas or the PLO during the day and share their win condition. If you have been forced onto a faction your new win condition is your faction leader's win condition.
If a citizen has been forced onto Hamas/PLO then they are considered a Palestinian citizen. If a citizen has been forced onto Israel then they are considered an Israeli citizen.
A good player count would be 13 (3 leaders, and 5 citizens on each side). The win conditions are staying private but know that no faction will share a win condition and I'd supply several premade win conditions for the day1 post so bluffing is more symmetrical.