Well known throughout the Islamic world as the foundational thinker for a significant portion of the contemporary Muslim intelligentsia, Sayyid Qutb (1906-1966) was a member of the Muslim Brotherhood and was jailed by Gamal Abdul Nasser's government in 1954. He became one of the most uncompromising voices of the movement we now call Islamism and is perhaps best known for his book, Ma lam fi al-tariq.