https://en.wikipedia.org/wiki/Category:American_people_imprisoned_abroad
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https://news.sky.com/story/who-are-the-three-us-prisoners-released-by-north-korea-11365134
Kim Dong Chul, 64, is a naturalised US citizen of South Korean origin who was arrested on 2 October 2015. He was once a resident of Virginia but had been living in China with his wife up until his imprisonment. He owned a business in Rason, a special economic zone of North Korea, but was accused of espionage. Little was known about his condition until January 2016 when he was introduced to a CNN news crew visiting Pyongyang. In March 2016, he appeared at a government-arranged news conference in Pyongyang and "apologised for trying to steal military secrets in collusion with South Koreans". South Korea denied any involvement. Other foreigners have been presented at news conferences in North Korea and admitted crimes against the North, but many said after they were released that their confessions were given involuntarily and under duress. In a one-day trial in April 2016, Mr Kim was sentenced to 10 years of hard labour.
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Tony Kim (Kim Sang-duk) is a Korean-American professor who was arrested during a month-long assignment as a guest lecturer at Pyongyang University of Science and Technology (PUST). PUST has been the only privately funded college in North Korea since its founding in 2010 with donations from Christian groups. Mr Kim and his wife were detained at Sunan International Airport in Pyongyang on 22 April 2017 as they waited to board a flight.
Mr Kim was subsequently arrested and imprisoned but authorities gave no reason. His wife was allowed to leave the country.
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Kim Hak Song is another US citizen who worked at PUST and was detained on 6 May 2017. His wife told CNN shortly after he was detained that he was an agricultural expert who had been teaching rice growing at the university. North Korea claimed he had been engaged in "hostile acts" against North Korea, KCNA reported.