The Muslim Brotherhood has agreed to back secular opposition voice Mohamed ElBaradei as official spokesman of Egypt’s opposition groups as the country teeters on the edge of revolt. But what exactly is the Brotherhood? And how should we think about the group that will likely play a major role in any new government that will be formed should Hosni Mubarak be ousted?

These questions are being asked and debated as more reports come out about the MB’s endorsement of ElBaradei and with pundits analyzing group’s initially muted approach to the protests. For answers, you should definitely read Lawrence Wright’s masterly, The Looming Tower. But in lieu of getting your hands on Tower—it’s brilliant, but it’s a tome—you might wade into the Internet for some answers. You will find a vigorous debate about who this group is and what they might mean for Egypt’s future. Vigorous and murky.

The murkiness comes from a disagreement among the pundits as to just how tolerant and non-violent the Brotherhood is—from the American perspective, as to whether we should fear the chance they might take power, or not. The Journal has a nice summary of the disagreement in its report on the MB and ElBaradei.

Some Middle East analysts argue that Egypt’s Muslim Brotherhood, the organization from which many of the region’s Islamists have taken inspiration, has a more moderate theological profile than is sometimes feared.

Unlike the Palestinian political group Hamas in the neighboring Gaza Strip, the Muslim Brotherhood isn’t considered a terrorist organization by Washington or by European capitals. Egypt has outlawed the group as a political party, but members of the movement sit in Parliament as independent lawmakers, and U.S. officials frequently meet with these parliamentarians.

Detractors, however, see the Brotherhood as an extremist organization, similar to the Islamic movement that overthrew the Shah of Iran in 1979. They point to a draft political manifesto published by the organization in 2007 in which the organization called for a religious guidance counsel to be set up in Egypt to approve all laws passed by the country’s civilian institutions. The political platform also states that Christians or women couldn’t become president.

The Brotherhood’s moderate wing disagreed with the manifesto, but the document helped exacerbate rifts between the group and Egypt’s leftist and liberal democracy activists. For that reason, it was seen as a significant development when Mr. ElBaradei forged the umbrella opposition movement last year with the approval and inclusion of the Brotherhood.

And for a more vivid illustration of the disagreement, The Daily Beast has run two he-said/he-said takes on the Brotherhood. There is “Beware Egypt’s Muslim Brotherhood,” by former Times columnist Leslie H. Gelb, in which he writes, “It would be delusory to take the MB’s democratic protestations at face value. Look at who their friends are—like Hamas.” And then there is, “Don’t Fear Egypt’s Muslim Brotherhood,” in which Brookings Institution Fellow Bruce Riedel writes:

The Egyptian Brotherhood renounced violence years ago, but its relative moderation has made it the target of extreme vilification by more radical Islamists. Al Qaeda’s leaders, Osama bin Laden and Ayman Zawahiri, started their political lives affiliated with the Brotherhood but both have denounced it for decades as too soft and a cat’s paw of Mubarak and America.

Caitlin Dickson at The Atlantic Wire has put in the hard yards aggregating a bunch of similar such pieces, excerpting from those arguing the MB is looking for a second Iranian-style revolution, to Think Progress writer Tonya Somanader calling the fear-mongering over the MB the “hardliners’ ‘delusion-du-jour.’” The piece and the posts it links to are well worth a read.

Something you should also read is Michael Downey’s interview with Khaled Hamza, editor of the Muslim Brotherhood’s official website, posted this afternoon on the website of The World Policy Journal. Downey had interviewed Hamza last summer when Hamza revealed the MB was already talking with ElBaradei. It’s a fascinating interview, conducted last Monday (before the MB became actively involved in the opposition protests), and says much about the approach of the moderate wing of the Brotherhood. Some highlights:

Joel Meares is a former CJR assistant editor.