Mohammad Najibullah Ahmadzai, commonly known as Dr. Najib, was an Afghan politician who served as the General Secretary of the People's Democratic Party of Afghanistan, the leader of the one-party ruling Republic of Afghanistan from 1986 to 1992 and as well as the President of Afghanistan from 1987 until his resignation in April 1992, shortly after which the mujahideen took over Kabul. After a failed attempt to flee to India, Najibullah remained in Kabul. He lived in the United Nations headquarters until his assassination during the Taliban's capture of Kabul.

The People's Democratic Party of Afghanistan (PDPA) was a Marxist–Leninist political party in Afghanistan established on 1 January 1965. Four members of the party won seats in the 1965 Afghan parliamentary election, reduced to two seats in 1969, albeit both before parties were fully legal. For most of its existence, the party was split between the hardline Khalq and moderate Parcham factions, each of which claimed to represent the "true" PDPA.