Prebilovci massacre
The Prebilovci massacre was an atrocity and war crime perpetrated by the Croatian Ustaše in the Independent State of Croatia during the World War II persecution of Serbs . 
<triplet> Ustaše <subj> Independent State of Croatia <obj> country <triplet> World War II persecution of Serbs <subj> Ustaše <obj> participant <subj> Independent State of Croatia <obj> country