They were the first modern terrorists and the forerunner of al Qaeda. But these days, the Muslim Brotherhood is becoming mainstream not only in Egypt, but in Washington, D.C.
While the final chapter of the so-called Arab Spring has yet to be written, it appears that radical Islamic forces could emerge as the big winners. None more so than the Muslim Brotherhood.
In Egypt, Tunisia, Libya, Syria and Jordan, the Brotherhood has used unrest to increase its influence.
The group is also making inroads closer to home, according to one expert.