They were trucked there and usually killed that day. But as the paranoia of the Khmer Rouge leaders grew, because the revolution wasn't working, it much of been subversion from the inside so the revolution turned on its self and anyone else suspected of anti revolution zeal. At one time 300 people were being murdered in a day, beaten to death with farming tools, throats slashed, hammers .
located in the outskirts of Phnom Penh, it’s an eye opening historical place though a depressing one. ticket is around 3$ and audio guide for same, 6$ total. once you start your tour, you will start imaging how all this genocide started by Khymer ruler against his own people. their are several sites which makes you go deep into thinking how can humans commit such atrocities and at one point you may just fail to imagine it in your head. a must see place in Phnom Penh.
This place has a lot of history on what happens to this poor people
The Tuol Sleng Genocide Museum is a museum in Phnom Penh, the capital of Cambodia, chronicling the Cambodian genocide. The site is a former secondary school which was used as Security Prison 21 by the Khmer Rouge regime from its rise to power in 1975 to its fall in 1979 .when in Cambodia try to visit as i did.
The Museum is so seral ; breathtaking and sad. RIP to all that perish.