http://www.globalsecurity.org/military/ops/iraq_insurgency.htmInsurgent Groups
Active Religious Seminary
Al-Faruq Brigades
Al-Sadr's Group
Ansar al-Islam
Armed Vanguards of Mohammad's Second Army
Black Banner Organization
Iraqi National Islamic Resistance
Iraqi Resistance Brigades
Iraq's Revolutionaries
Islamic Armed Group of al-Qaida, Fallujah branch
Jihad Cells
Liberating Iraq's Army
Mujahideen Battalions of the Salafi Group of Iraq
Muslim Fighters of the Victorious Sect (aka, Mujaheddin of the Victorious Sect)
Muslim Youth
Nasserites
National Iraqi Commandos Front
Salafist Jihad Group
Snake Party
Sons of Islam
Wakefulness and Holy War
White Flags
Ba'athist or probable Ba'athist
General Command of the Armed Forces, Resistance and Liberation in Iraq
New Return
Patriotic Front
Political Media Organ of the Ba?ath Party (Jihaz al-Iilam al-Siasi lil hizb al-Baath)
Popular Resistance for the Liberation of Iraq
Return
Saddam's Fedayeen
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
The exact elements attacking the US-led coalition's nation building effort remain unclear. Some of those suspected of being behind attacks against Coalition Forces are ordinary Iraqi criminals. Saddam released thousands of criminals from jail before the war, allowing these once detained criminals to roam the streets and command strikes against Coalition Forces. The insurgents appear to include a mix of Saddam loyalists, Baath Party hard-liners, possibly Sunni tribal elements who fear a loss of their former importance, and simple Iraqi nationalists. Outside insurgents may include Arab volunteers recruited before 2003 by Saddama's regime, Arabs who infiltrated after the war, and Iraqi groups like Al Ansar that have some ties to Al Qaida. They may include some elements with direct ties to Al Qaida. It is reported that fewer than 250 of the 9,000 detainees in US custody as of late August 2003 were foreign nationals. This suggests that either the bulk of the attackers are Iraqi, or that the bulk of the detainees were common Iraqi criminals rather than guerilla combatants.
...
In addition, L. Paul Bremer may have unleashed these former soldiers against US Troops by disbanding the Iraqi military. These former Guard members are without any income, but still are armed and ready to kill, making US Troops vulnerable to attack. While the Republican Guard experienced high casualties in the US strikes on Baghdad, the Special Republican Guard was not especially involved in this part of the war, allowing them to disappear with a number of weapons and munitions. Approximately 40,000 men were members of the Republican Guard. According to the 12 August 2003 New York Times, there is an estimated 100,000 former Iraqi security service members without employment, mostly concentrated in the Sunni Triangle, the same region where many of the attacks have occurred.
...