The Egyptian Muslim Brotherhood has been a central player in the emergence and spread of Islamic political opposition, protest, and violence in the Middle East and around the world. Not only does it continue to be an important force in Egypt, the group has spawned many of the militant Islamic groups that exist today, including organizations such as Hamas, Islamic Jihad, and Gammaat Islamiyah. My research focuses on understanding the initial rise of the organization in the 1920s, 30s, and 40s, the continued appeal of its message in Egypt and elsewhere, and the evolving relationship of the organization to the state. I report on this work in Islamic Mobilization: Social Movement Theory and the Egyptian Muslim Brotherhood (Sociological Quarterly 42(4), 2001: 487-510). In the article, I use declassified U.S. State Department files along with other historical data to understand the growth of the organization as well as the role of ideas in social movements more generally.