“The Brotherhood, founded in 1928, remains the most influential mainstream Sunni Islamist group,”
That is the image, but while “mainstream” helps promote those who remain publicly known as members, their schools and the Wahabi schools and teachers share the same curriculum and the mentors of every FUNDAMENTALIST Islamic leader and every Al Queda leader were or are members or associates of the Brotherhood.
They do not see themselves or their objectives as any different than Al Queda or the Taliban, only that they have a different role - subversion of Muslim and non-Muslim societies from within.