Coniston massacre
The Coniston massacre, which took place near the Coniston cattle station in the then Territory of Central Australia (now the Northern Territory) from 14 August to 18 October 1928, was the last known officially sanctioned massacre of Indigenous Australians and one of the last events of the Australian Frontier Wars. People of the Warlpiri, Anmatyerre, and Kaytetye groups were killed. The massacre occurred in revenge for the death of dingo hunter Frederick Brooks, killed by Aboriginal people in August 1928 at a place now known as "Yukurru", also known as Brooks Soak.
Reginald Dyer
Sir Michael O'Dwyer, Lieutenant-Governor of Punjab from 1912 to 1919, endorsed Dyer and called the massacre a "correct" action. Some historians now believe he premeditated the massacre and set Dyer to work. Many Indians blamed O'Dwyer, and while Dyer was never assaulted, O'Dwyer was assassinated in London in 1940 by Udham Singh in retaliation for his role in the massacre.