Hutu Rwanda, this led to the "Social revolution" and Hutu violence against Tutsis. Tens of thousands of Tutsis were killed and many others fled to neighboring countries, such as Burundi, Uganda and expanding the Banyamulenge Tutsi ethnic group in the South Kivu region of the Belgian Congo. Later, exiled Tutsis from Burundi invaded Rwanda, prompting Rwanda to close its border with Burundi. In Burundi, a campaign of genocide was conducted against Hutu population in 1972, and an estimated 100,000 Hutus died. In 1993, Burundi's first democratically elected president, Melchior Ndadaye, who was Hutu, was believed to be assassinated by Tutsi officers,
Hutu Power public life, complete segregation of Hutus from Tutsis, and complete exclusion of Tutsis from public institutions and public life. Hutu Power ideology reviled Tutsis as outsiders bent on restoring a Tutsi-dominated monarchy, and idealized all things Hutu. The Commandments declared that any form of relationship between Hutus and Tutsi women was forbidden; and that any Hutu who "marries a Tutsi woman", "befriends a Tutsi woman", or "employs a Tutsi woman as a secretary or a concubine" was a traitor to the Hutu people. It denounced Tutsis as dishonest in business whose "only aim is the supremacy of his ethnic group";