Check this entry posted by Discover the Networks to become familiar with the history and goals of the Muslim Brotherhood. Excerpt:
. . . The Brotherhood was founded in accordance with al-Banna's proclamation that Islam be "given hegemony over all matters of life." Accordingly, the Brotherhood seeks to establish an Islamic Caliphate spanning the entire Muslim world. It also aspires to make Islamic (Shari'a) law the sole basis of jurisprudence and governance. Toward this purpose -- encapsulated in the Brotherhood's militant credo: "God is our objective, the Koran is our Constitution, the Prophet is our leader, struggle is our way, and death for the sake of God is the highest of our aspirations" -- the Brotherhood since its founding has supported the use of armed struggle, or jihad. The Brotherhood supports the waging of jihad against non-Muslim "infidels," and has expressed support for terrorism against Israel, whose legitimacy the Brotherhood does not recognize, and against the West, particularly the United States. . .
. . . In May 1991 the Muslim Brotherhood issued to its ideological allies an explanatory memorandum on "the General Strategic Goal for the Group in North America." Explaining that the Brotherhood's mission was to establish "an effective and ... stable Islamic Movement" on the continent, this document outlined a "Civilization-Jihadist Process" for achieving that objective. It stated that Muslims "must understand that their work in America is a kind of grand Jihad in eliminating and destroying the Western civilization from within and 'sabotaging' its miserable house by their hands ... so that ... God's religion [Islam] is made victorious over all other religions." The Brotherhood listed some 29 likeminded "organizations of our friends" seeking to realize the same goal; among these were the Islamic Society of North America, Muslim Youth of North America, the Islamic Circle of North America, the Muslim Students Association, the Muslim Arab Youth Association, the Islamic Association for Palestine, the United Association for Studies and Research, and the International Institute of Islamic Thought. (more . . .)