The Muslim Brotherhood (Ikhwan-ul-Muslimin): Yes it is an Egyptian Islamist Terrorist Organization
This is the same organization responsible for the Assassination of Anwar Al-Sadat of Egypt. They are a Sharia supporting Terrorist organization, which many have tried to normalize. The reality is that they should not be treated differently because they have become more tech savvy. They even have an official English website! http://www.ikhwanweb.com/
Thier goal is to remove the secular government in Egypt and put in a Morsi type Islamist. Unfortunately we have their agents here in the USA and they even worked for Obama's DHS and USDS! You will notice they will support organizations like CAIR and MPAC as well.
Let's make sure we DESIGNATE them as what they are...a TERRORIST ORGANIZATION: http://counterjihad.com/designate/