Previously the Muslim Brotherhood tried to assassinate President Nasser and were involved in the assassination of President Sadat.
Many of its members are engaged in terrorists activities and have spawned terrorists groups such as Hams and Egyptian Islamic Jihad.
Their goal is to establish Islam throughout the ME and ultimately, the world. It also promotes violence against the US and Israel, the Brotherhood is viewed by many as the root source for Islamic terrorism. It not only condemned the US for killing Bin Laden, but also helped the growth of Al Qaida. Bin Laden's mentor and his deputy originated from the Muslim Brotherhood!
The mastermind of the 9/11 attacks Khalid Sheik Mohamed grew up in the Kuwaiti Muslim Brotherhood.
Enough for ya'?