You probably remember hearing about Charles Jenkins, who left his US Army post in 1965 and defected to North Korea. Over the next 40 years he was beaten, starved and lost his identity. In 2004 he was reunited with his wife and children, with whom he lives in Japan.
In fact, Charles Jenkins wasn’t the only American held in North Korea. A North Korean who defected, Yong Kim, testified in the late 1990’s that:
“There are ten political prison camps, and in Camp No. 14 alone 15,000 inmates were assigned to hard labor. Aside from the estimated 15,000, there were ... some British and American POW's who were captured near Jang-jin Lake in South Hamkyong Province during the Korean War.”