BBC News Online profiles other Islamic groups emerging in Iraq, as part of a guide to the key players in post-Saddam Iraq.
IRAQI NATIONAL CONSTITUENT CONGRESS
The Iraqi National Constituent Congress has brought together prominent Sunni and Shia figures to oppose the US-led occupation of Iraq.
It was formed in May 2004 and is led by the respected Shia cleric Jawad al-Khalisi.
On its 16-strong leadership panel are other Shia leaders, and also Sheikh Harith al-Dhari, leader of the Sunni Muslim Ulema Council.
The group's 500 members also include Kurds and Arab nationalists.
It has pledged to boycott any US-sponsored political group, including the Iraqi Governing Council, to re-establish the national army and to restore sovereignty under the auspices of the United Nations.
MOHAMMED BAHR AL-ULLOUM
Mohammed Bahr al-Ulloum, a Shia cleric from Najaf, is a highly respected religious scholar viewed as a liberal.
He fled Iraq in 1991 after several members of his family were killed by Saddam Hussein's regime.
Mr Ulloum has been a leading member of the Iraqi Governing Council, holding its rotating presidency in early 2004.
He temporarily suspended his participation, accusing the US of failing to provide security, after a car bomb in Najaf killed a leading Shia cleric and about 120 others in August 2003.
At the time he also threatened to set up Iraqi armed militias to secure Shia holy sites.
His son was appointed Oil Minister in September 2003, but has not retained the post in the interim government appointed in June 2004.