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.
Kevin O'Higgins
None of the three assassins was ever apprehended or charged, but Coughlan, a member of Fianna Fáil as well as the IRA, was killed in strange circumstances in Dublin, in 1928, by a police undercover agent whom he was attempting to murder. The other two (Doyle and Gannon) benefited from the amnesty to IRA members issued by Éamon de Valera, upon his assumption of power in 1932. Gannon, who died in 1965, joined the Communist Party of Ireland and played a central role in organising Irish volunteers for the Spanish Civil War. Yet in party publications his part in assassinating O'Higgins is downplayed.Doyle remained a prominent IRA militant and took part in various acts in the early 1940s. He lived to an old age, dying in 1980, and continued to take pride in having killed O'Higgins.