Infusion Incident

The Infusion Incident was the cause of the Grunt Rebellion. It involved the San'Shyuum secretly infusing the Unggoy's nourishment with medicine which made the male Unggoy sterile. This all was done in order to keep the ever-growing Unggoy population in check. Eventually the San'Shyuum's conspiracy got out to public, which resulted in all Unggoy revolting against the other species in the Covenant.