The Muslim Brotherhood is to Islamic terrorism what a virus is to disease. Major terrorist leaders from the Caliph of ISIS to Arafat have the Muslim Brotherhood on their resume. And the current leader of Al Qaeda led a Muslim Brotherhood splinter terror group. But its linkages to Islamic terrorism are only a secondary aspect of the organization whose focus is on Islamizing nations through more subtle means.
Paradoxically the Brotherhood has met with far less success in the Muslim world than in the West. Its greatest victories in the Arab Spring would not have happened without Obama's backing and its takeovers of Egypt and Tunisia were rolled back by popular uprisings while its efforts in Libya, Syria and Yemen were stymied by armed conflict with other Muslims.
The Muslim Brotherhood is unpopular in Egypt these days. It's also unpopular with Americans.