United Nations Assistance Mission for Rwanda
In 1994, almost all Rwandan people (85%) were Hutus.  However, for many years, the Tutsi minority had more power and ran the Rwandan government.  From 1990-1993, the two groups had fought a civil war about who would control the government.  This war ended with a peace treaty in 1993.  One of the reasons UNAMIR got involved was to make sure both sides obeyed that agreement.