There was blood throughout all the land of Egypt. ~ Exodus 7:21
The fifth faction is the army. The generals have all been made wealthy by corruption. The rank and file are not thugs but regular, everyday Egyptians. So far, the soldiers have refused to fire on the protesters but they have followed the orders of their generals and not protected the people from the pro-Mubarak hooligans.
Eventually, the soldiers will have to decide - do they obey their generals and attack the masses or do they side with the Egyptian people and attack their generals?