▁the ▁last , ▁system atic ▁mass ac res ▁of ▁Ab original ▁Austral ians ▁recorded ▁in ▁Australia . ▁ ▁The ▁four ▁ab original ▁Mand j ild j ara ▁brothers ▁entered ▁Wal ma jar ri ▁country ▁and ▁system atically ▁purs ued ▁and ▁killed ▁many ▁Wal ma jar ri ▁men , ▁women , ▁and ▁young ▁children ▁and ▁kid n apped ▁other ▁young ▁women ▁as ▁w ives ▁near ▁Jap ing ka ▁in ▁Wal ma jar ri ▁country . ▁In ▁March ▁ 1 9 6 1 , ▁two ▁of ▁the ▁perpet rat ors ▁were ▁app reh ended ▁and ▁sent enced ▁to ▁ 5 0 ▁days ▁prison ▁for ▁killing ▁a ▁bul lock , ▁but ▁released ▁from ▁prison ▁within ▁a ▁few ▁days ▁after ▁inten se ▁lo bb ying ▁of ▁the ▁Government ▁by ▁various ▁industrial ▁un ions ▁in ▁W A . ▁They ▁were ▁never ▁charged ▁with ▁murder ▁or ▁child ▁ab du ction . ▁ ▁Queensland ▁▁ 1 9 1 0 s ▁▁▁ 1 9 1 8 ▁B entin ck ▁Island : ▁Part ▁of ▁the ▁W elles ley ▁Islands ▁group , ▁which ▁includes ▁Mor ning ton ▁Island , ▁B entin ck ▁Island ▁was ▁home ▁to ▁the ▁K ai ad ilt ▁cl an ▁of ▁just ▁over ▁ 1 0 0 ▁people . ▁In ▁ 1 9 1 1 , ▁a ▁man ▁by ▁the ▁name ▁of ▁McK en zie ▁( other ▁names ▁unknown ) ▁was ▁given ▁a ▁government ▁le ase ▁for ▁nearby ▁S we ers ▁Island ▁that ▁also ▁covered ▁the ▁eastern ▁portion ▁of ▁the ▁much ▁larger ▁B entin ck ▁Island . ▁Ar riv ing