Sheikh Musa Hilal, Janjaweed leader
Chief of the Jalul ethnic group from northern Darfur, Sheikh Musa Hilal is a leader of the pro-government Arab Janjaweed militia.
He is accused of allowing some of the worst atrocities in Darfur, where violence since the outbreak of hostilities in early 2003 has killed some 100,000 people and created 2m refugees.
A man of considerable wealth Mr Hilal is said to live in the capital, Khartoum, from where he directs his operations.
His militia are blamed for pillaging, rape, and scorching of villages in Darfur.
The Janjaweed are well armed with automatic weapons and ride well-fed horses and camels.
The government denies claims that they backing them.
Mr Hilal told the BBC in 2004 that the blame for any deaths in Darfur should be laid at the feet of the rebel Sudan Liberation Army, whom he accused of starting the conflict.
He is in the only high profile figure amongst the four men now subjected to UN sanctions.
Click here to read Musa Hilal's full profile
Gaffar Mohamed Elhassan, ex-air force commander
Maj Gen Gaffar Mohamed Elhassan was a commander responsible for Darfur in the Sudanese air force.
He is accused of co-ordinating operations between the Janjaweed and government forces.
Darfuri refugees who have fled attacks on their villages say after air raids by government aircraft, the Janjaweed would ride in on horses and camels, slaughtering men, raping women and stealing whatever they could find.
Our correspondent says Maj Gen Elhassan is now thought to be in retirement.
Adam Yacub Shant, rebel commander
Adam Yacub Shant is a commander of the rebel Sudanese Liberation Army (SLA), one of the main rebel groups to take up arms against the government claiming that the region was being neglected by Khartoum.
The rebels say the government is oppressing black Africans in favour of Arabs.
Mr Shant is accused of violating a ceasefire agreement in July 2005 when he ordered SLA forces to attack government troops.
Three government soldiers were killed in the attack.
Formed in early 2002 the SLA consists primarily of Darfur's farming tribes - the Zaghawa, Fur and Massaleit.
The SLA is biggest rebel group in Darfur, but internal splits within the movement have been obstructing peace talks with the government being held in Nigeria's capital, Abuja.
Gabril Abdul Kareem Badri, rebel field commander
Gabril Abdul Kareem Badri is a field commander of a small rebel group in Darfur called the National Movement for Reform and Development (NMRD).
He is accused of kidnapping members of the African Union (AU) peacekeeping mission in Darfur in October 2005.
A month later he threatened to shoot down an AU helicopter, AFP reports.
The cash-strapped AU has 7,000 peacekeepers in Darfur, struggling to contain the violence.
The AU is also sponsoring peace talks between the government and rebel groups in Abuja.
The NMRD has not been included in these negotiations.
It is thought that the NMRD broke away in 2004 from the Justice and Equality Movement, one of two main rebel groups in Darfur.
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