Crackdown Filling NKorean Prisons With Defectors North Korea's prison population has swelled with those caught fleeing the country under a crackdown on defections by young leader Kim Jong Un, according to defectors living in South Korea and researchers who study Pyongyang's notorious network of labor camps and detention centers. Soon after he succeeded his father as North Korean leader, Kim is believed to have tightened security on the country's borders and pressured Pyongyang's neighbor and main ally, China, to repatriate anyone caught on its side of the frontier. In interviews with The Associated Press and accounts collected by human rights groups, North Koreans who have managed to leave the country say those who are caught are sent to brutal facilities where they now number in the thousands. "They are tightening the noose," said Insung Kim, a researcher from the Database Center for North Korean Human Rights who gets to interview most defectors soon after their arrival in South Korea. This is to set an example to the North Korean people. The plight of those caught fleeing the North was highlighted last month when nine young North Koreans were detained in Laos, a key stop along a clandestine escape route through Southeast Asia that had previously been thought safe. Instead, the Lao government turned them over to Pyongyang. While the high-profile nature of their repatriation might offer them some protection, human rights group fear for them. "Forced repatriation from China is a pathway to pain, suffering, and violence," according to "Hidden Gulags," an exhaustive 2012 study on the prison camps by veteran human rights researcher and author David Hawk. Arbitrary detention, torture and forced labor are inflicted upon many repatriated North Koreans. In 2003, Park Seong-hyeok, then 7, and his parents were arrested trying to reach Mongolia from China and sent back to North Korea. He ended up at a prison in the northern city of Chongjin, where he was packed in with other kids, some of them homeless children rounded up off the streets. They were blindfolded each day and forced to clear land for agriculture, he said. If they refused, they were beaten. "I couldn't even tell whether I was alive," Park said. We were provided five pieces of potato a day, each about the size of a fingernail.  After a few months, he managed to escape after his uncle bribed the guards. With the help of relatives, he made it to South Korea, where he now attends a special school for North Korean defectors. But he assumes his parents, who he has not seen in 10 years, remain imprisoned in the North. In the 18 months since Kim took power, any hopes the 20-something ruler would usher in a new era of human rights reforms have been squelched. Defectors pose a particular threat to the Pyongyang regime, human rights groups say, because of the stories they tell the world about the plight of the North Korean people, and the information and money they send back in. North Korea considers those who leave the country to be guilty of treason and subject to up to five years of manual labor. In addition, the penal code states if the nature of the defection is "serious" - taken by most researchers to mean if the defector gets the help of South Korean or American Christian missionary groups as opposed to trying to reach China for work purposes - the defector risks an additional charge of anti-state activities that could mean life in prison or even death.