Minorities in Iraq include various ethnic and religious groups.
Kurds are an Indo-European people of the Iranian branch. Ethnically and linguistically they are most closely related to Iranians and have existed in Iraq since before the Arab-Islamic conquest. They are possibly descended from the ancient Corduene.
The majority of Kurds are Sunni Muslims, with Shia and Alevi Muslim minorities. There are also a significant number of adherents to native Kurdish/Iranian religions like Yarsanism. There are also minorities of Christians and Jews. Some Kurdish Communists and Socialists are Atheist.
Under the Kingdom of Iraq, Kurdish leader Mustafa Barzani led a rebellion against the central government in Baghdad in 1945. After the failure of the uprising Barzānī and his followers fled to the Soviet Union. In the 1960s, when Iraqi Brigadier Abdul-Karim Qassem distanced himself from Egyptian president Gamal Abdel Nasser, he faced growing opposition from pro-Egypt officers in the Iraqi army. When the garrison in Mosul rebelled against Qassem's policies, he allowed Barzānī to return from exile to help suppress the pro-Nasser rebels. By 1961, Barzānī and the Kurds began a full-scale rebellion.
When the Ba'ath Party took power in Iraq, the new government, in order to end the Kurdish revolt, granted the Kurds their own limited autonomy. However, for various reasons, including the pro-Iranian sympathies of some Kurds during the Iran–Iraq War in the 1980s, the regime implemented anti-Kurdish policies and a de facto civil war broke out. From March 29, 1987 until April 23, 1989, the infamous Al-Anfal campaign, a systematic genocide of the Kurdish people in Iraq, was launched. For this, Iraq was widely condemned by the international community, but was never seriously punished for oppressive measures, including the use of chemical weapons against the Kurds, which resulted in thousands of deaths.