It is one of history's greatest unknown crimes: More than a million people were brutally killed after Indonesia's military coup in 1965.The victims were accused of being communists, an umbrella that included not only members of the country's Communist Party, but all those who opposed General Suharto's new military regime.The killers were often members of paramilitary groups or death squads that carried out the executions with the approval of the military government and killed with impunity.The perpetrators have stayed in power, living alongside the survivors and the victims' families who were threatened into silence. Fear and anti-communist rhetoric persist in Indonesia today.For nearly 10 years, American filmmaker Joshua Oppenheimer researched and documented the atrocities.He spoke to victims and their families as well as the perpetrators of the crimes, shedding light on Indonesia's dark past and today's impunity in his two films, The Look of Silence (2014) and The Act of Killing (2012).His first film tells the story from the point of view of the killers - some of whom are celebrated as heroes in Indonesia today. The Look of Silence follows an optometrist, born two years after his brother was killed, as he meets those responsible for his brother's death.'Neither film is a historical documentary about events 50 years ago. Both films are about a present-day regime of fear that subsists because everybody knows who the perpetrators are and knows what the perpetrators did,' Oppenheimer tells Al Jazeera.He says the perpetrators in his films are performing - rather than reenacting the past - 'the present-day fantasies, lies, stories they tell themselves so they can live with what they've done.'Oppenheimer says that the films are fundamentally about impunity, but as he dug deeper, he realised it wasn't unique to Indonesia.'What I was really finding there was an allegory for an impunity that defines so many of our societies.'The filmmaker explains how his films have helped