Syrian President Bashar al-Assad used sarin gas on his own people in an Aug. 21 chemical weapons attack n which more than 1,000 civilians died, according to U.S. officials.
The 30-year-old North Korea leader, who succeeded his father Kim Jong-il after his death in 2011, has been fiercely criticized by human rights groups for crimes against humanity -- including reports of public executions.
Multiple reports recently surfaced claiming that Kim Jong Un's former girlfriend was among those executed by a firing squad in August.
Zimbabwean President Robert Mugabe gestures during the country's Heroes Day Commemorations, in Harare, Monday, Aug. 13, 2012.
Mugabe says his party's symbol of a raised fist was used to fight colonial-era white rule and is not a gesture of violence toward fellow Zimbabweans. He says that the power of the fist symbol helped the party defeat colonial oppression and is urging the nation to peacefully prepare for a referendum on a new constitution and elections afterward. (AP Photo/Tsvangirayi Mukwazhi)
As President of Uganda since 1986, Yoweri Museveni and his regime have been accused of massacres in the Democratic Republic of the Congo, among many other alleged human rights abuses.
During the civil war in northern Uganda, more than 1.5 million people were forced into camps, where many were beaten, raped and killed. Museveni has also come under fire for holding elections that are neither free nor fair.
Isaias Afewerki, Eritrea's first and only president since 1993, is accused of funding armed insurgent groups in neighboring countries, like Ethiopia and Djibouti. Human rights organizations claim that arbitrary arrests, torture and enslavement are rampant under his control.
Sudanese President Omar al-Bashir has committed mass genocide in the now decade-old conflict in Sudan's Darfur region, according to the international community. Multiple human rights groups have demanded that he be arrested by U.S. authorities for such atrocities if he attends the UN General Assembly meeting in New York.
As global leaders arrive in New York this week for the UN General Assembly, FoxNews.com takes a look at what it takes to be one of the world's greatest despots.