1Khmer Rouge followed communist icons : prison chief .
2The Khmer Rouge 's former jailer said Tuesday the regime practised a `` criminal '' mix of the theories of Marx , Lenin and China 's `` Gang of Four '' as it killed thousands of people in the 1970s .
3Kaing Guek Eav , better known by his nom de guerre Duch , is on trial for overseeing the torture and extermination of 15,000 people who passed through the hardline communist movement 's notorious Tuol Sleng prison .
4Duch told the UN-backed war crimes court that Khmer Rouge leader Pol Pot , who died in 1998 , applied a mix of communist ideas to orchestrate extreme social reforms .
5But he said the regime had `` more seriously cruel policies than those of -LRB- the -RRB- Gang of Four of China '' since it enslaved the population on collective farms and began to carry out mass killings immediately after seizing power .
6`` The policy of -LRB- the Khmer Rouge -RRB- was criminal , '' Duch said .
7`` The killing was widespread . ''
8He added that only the `` collective peasant class and collective worker class '' remained throughout the country after the educated and elites were murdered .
9The former maths teacher , 66 , wearing a white long-sleeved shirt , told the court that the Khmer Rouge 's policy was to root out all enemies who did not share its ideology .
10Duch apologised at his trial late March , saying he accepted blame for the extermination of thousands of people at the prison , which served as the centre of the 1975-1979 regime 's security apparatus .
11On Monday Duch told the trial that his staff had murdered babies by smashing them against trees at a `` killing field '' .
12But he has denied prosecutors ' claims that he played a central role in the Khmer Rouge 's iron-fisted rule , and maintains he only tortured two people himself and never personally executed anyone .
13Duch faces life in jail if convicted by the court .
14Many believe the tribunal is the last chance to find justice for victims of the regime , which killed up to two million people .
15The court was formed in 2006 after nearly a decade of wrangling between the United Nations and the Cambodian government , and is expected next year to begin the trial of four other senior Khmer Rouge leaders also in detention .