In addition to ensuring its military and security protection through the IRGC and the Basij, the Islamic Republic employs a number of other institutional means to protect itself from un-Islamic influences, potential opponents in society, and the possibility of systematic problems and internal obstacles. Of these latter group of institutions, three stand out for their compound effects in helping the system maintain itself. They are the Guardian Council, the Expediency Council, and the judiciary. Each institution in its own way contributes significantly to maintaining the system. The Guardian Council performs a pivotal gatekeeping function by ensuring that only the legislation it approves becomes the law of the land, and only the candidates it vets get a chance at holding elected office. When the Guardian Council and the Majles reach a deadlock over legislation, the Expediency Council is meant to determine what is in the ultimate interest of the system so that its overall performance is not undermined. And, the judicial branch protects the system from political opponents and sees to the Islamization of Iranian society. The Islamic Republic system, in short, has devised a number of institutional means to guarantee its long-term resilience.