FrontPage provides a few facts about the Muslim Brotherhood:
The recent electoral victory of the outlawed Egyptian Muslim Brotherhood (MB), which won 88 seats up from 15 in the 454 member Parliament, should not be celebrated as an indication of liberalization, democracy and freedom. Neither should the 62 seat win predicted for Hamas - the MB’s progeny - in the Palestinian territories. Both the MB and Hamas are exploiting the U.S. call for democratization in the Middle East, using free elections to gain legitimate political power. However, neither organization has changed its charter; both seek to create a global Islamic state, where life would be dictated by the Shari’a.
The MB was founded in 1928. It's influence since then has been enormous:
The MB is the fountainhead from which Sunni terrorist organizations such as Al-Qaeda, Hamas, Palestinian Islamic Jihad, Gamaat Islamiyyah, Hizb-ut-Tahrir, and the Abu Sayyaf group have sprung. Their ties to the MB are clearly evident from their identical strategic agenda.
It was, thus, heavy symbolism for Osama bin Laden to have an Egyptian lead the 9/11 attackers.
Link via Jihad Watch.