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.
Kilcoy, Queensland
Up until the early 1990s Mackenzie himself was a prime suspect but recent research suggests that he himself was probably not responsible for the massacre, since he was in Sydney at the time. The Mackenzies were admonished for this mass killing by Attorney-General John Hubert Plunkett (1802–1869), who threatened prosecution if an official complaint was lodged. Though MacKenzie's involvement was never verified, this incident was mentioned in a select committee in 1861 and repeated by W. Coote in 1867. The English overseer disappeared upon Mackenzie's return. Mackenzie organised the conspiracy of silence to protect the Englishman.