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- Abu Jandal : Bodyguard to Osama bin Laden, captured in 2002 and who has provided information on al-Qaeda
- Abu Muhammad al-Maqdisi : A Salafist theologian with much influence on Jihad, currently in Jordan; some affiliation with al-Qaeda but not necessarily in full agreement with their approach
- Al-Qaeda : International islamist terrorist network. Responsible for the 9-11 attack and other terrorist attacks.
- Ayman al-Zawahiri : Generally considered the #2 leader of al-Qaeda, an Egyptian physician who was mentored, in a faction of the Muslim Brotherhood, by Sayyid Qutb
- Jihad : Literally meaning "struggle", a Muslim concept that can refer to an inward-directed personal process to submit to God's will, or to an external combat with the enemies of Islam
- Salafism : A strict branch of Sunni Islam, dedicated to the restoration of the Caliphate, often by means of armed jihad
- Sayyid Qutb : Born in 1906, radicalized in 1951, and executed in 1966, an influential theorist of Salafist revolutionary Islam; considered one of the two spiritual fathers of al-Qaeda and the mentor of Ayman al-Zawahiri
- Takfir wal-Hijra : An extreme Salafist organization of Egyptian origin, whose executed leader wanted to withdraw from modern society, build strength, and then excommunicate and kill those they considered apostates, such as Osama bin Laden
- Wahhabism : A socially conservative branch of Sunni Islam, strongest in the House of Saud, which rules Saudi Arabia