Marco Longari /AFP/Getty Images
Muslim Brotherhood spokesman Mohammed Mursi takes questions from local and international journalists at the end of a news conference Feb. 9 in Cairo.
The Muslim Brotherhood is Egypt's oldest and most organized opposition group. It also was banned under President Hosni Mubarak, who stepped down last week.
What role the Brotherhood will play in the Egypt of the future worries some in the United States, Israel and other countries. They fear the group will do in Egypt what the Shiite clerics did in Iran after protesters ousted the late shah: Turn Egypt into an Islamist state and an enemy of Israel.
But many in Egypt dismiss such concerns as fear-mongering.
Strategic Use Of Power
The Brotherhood's power was evident in the northern port city of Alexandria earlier this month.
The group's leaders called on thousands of supporters to pour into the streets day after day to keep up pressure on the Mubarak regime.
Egyptian security officials were worried enough to round up people with ties to the Brotherhood the week before. Among those arrested was Sobhi Saleh of Alexandria, a former lawmaker who headed a parliamentary bloc aligned with the banned movement.
What Is The Muslim Brotherhood?
Founded in 1928 by Hasan al-Banna.
It has been banned in Egypt off and on since 1948.
The Brotherhood has branches, or has inspired political parties, in countries including Kuwait, Saudi Arabia, Jordan, Bahrain, Yemen, Somalia, Sudan and the Gaza Strip.
"Widely considered the world's most influential Islamist organization," according to the Council on Foreign Relations.
The 1960s prison writings of member Sayyid Qutb laid the foundation for radical Islamists, who eventually broke with the Brotherhood, including the notion that regimes that do not rule according to Islamic law are illegitimate and can be attacked.
Ayman al-Zawahiri, the No. 2 leader of al-Qaida, was once a member of the Muslim Brotherhood.
The Egyptian Muslim Brotherhood has been accused of supporting Hamas and Hezbollah, but has not engaged itself in political violence since the 1970s.
It operates social services such as day care centers, schools, banks and hospitals.
The group controls several professional associations, including those representing engineers, doctors and lawyers.
There are divisions in the modern Muslim Brotherhood between those who favor political participation and those who don't.
In 2005, the group won 20 percent of the parliamentary seats it contested. In 2010, just one Muslim Brotherhood candidate won as an independent.
For decades the group formed the primary organized opposition against Egypt's President Hosni Mubarak.
Western analysts are now debating the extent of the group's popularity and the question of whether its political ascent would lead to Iranian-style Islamic rule.
— By Alan Greenblatt
Supporters freed Saleh from prison and he soon was out protesting again.
Saleh calls the Brotherhood the most powerful force among the Egyptian people. But he and other leaders hasten to add that they will make no grab for power in a post-Mubarak Egypt.
A Reach That's Deep, And Wide
Whether those statements are true or not, the Brotherhood can't be ignored. It claims 600,000 members, and even as a banned movement, it managed to win one of every five seats in Parliament during the 2005 elections.
Mubarak has used the group's sometimes violent past to justify a stifling state-of-emergency law that has been in place for 30 years.
But many analysts describe the Brotherhood as a moderate Islamic political and social movement that is fiercely nationalistic and engages in philanthropy. It appeals largely to Egypt's urban professionals and the middle class.
Many of the group's leaders are well-educated — physicians and pharmacists and engineers.
Khaled Fahmy is chairman of the history department of the American University in Cairo. He and other Egyptians interviewed for this story believe the Brotherhood has as much right as anyone to help shape their country's future, as long as it doesn't try to take over.
Brotherhood officials say they have no such plans.
At a news conference last week, spokesman Mohammed Mursi said the Brotherhood will not run a presidential candidate in any upcoming elections and wants nothing more than to "collaborate" in creating a new Egypt.
And while Brotherhood supporters joined the protests, the group took no leadership role in the uprising that swept Mubarak from power.
The Power Of A Passive Approach
Reached in London, Middle East analyst Fawaz Gerges says the Brotherhood's passive approach is not surprising.
"They are trying to position themselves as a centrist mainstream force as opposed to a radical and militant force," Gerges says, adding that the Brotherhood is also eager to avoid provoking Egypt's military government into a crackdown.
"They realize if they mobilize their followers, if they try to go unilateral," Gerges says, "they might end up with the Algerian model of the 1990s, when the Islamists won an outright victory and that particular victory led to a civil war between Islamists on one hand and the Algerian army."
That doesn't mean the Brotherhood will give up its quest for a more Islamic Egypt, says historian Khaled Fahmy.
"They are a very important player, and again, as long as they agree on the principle of equality and the principle of the rule of law, I think they should be included in the political discussion of the future of Egypt," Fahmy says.
But blogger Gigi Ibrahim, who is part of the youth movement that helped bring down Mubarak, is more skeptical.
"They have been created to scare us from democracy," Ibrahim says. "And now that we have democracy, it will be interesting [to see] who they really are."