According to Sayyid Qutb, a prominent member of the Egyptian Muslim Brotherhood in the 1950s and 60s, the Quran "gives the man the right of 'guardianship' or 'superiority' over the family structure in order to prevent dissension and friction between the spouses. The equity of this system lies in the fact that God both favoured the man with the necessary qualities and skills for the 'guardianship' and also charged him with the duty to provide for the structure's upkeep." Qutb's ideologies are still impactful today, for radical Islamists, influencing such prominent Middle Eastern leaders as Ayman Zawahiri and terrorist Osama bin Laden.