Iraqi biological weapons program
Saddam Hussein (1937–2006) began an extensive biological weapons (BW) program in Iraq in the early 1980s, despite having signed (but not ratified until 1991) the Biological Weapons Convention (BWC) of 1972. Details of the BW program and a chemical weapons program surfaced after the Gulf War (1990–91) during the disarmament of Iraq under the United Nations Special Commission (UNSCOM).
Source: Wikipedia — Iraqi biological weapons program (CC BY-SA 4.0)