Has any of your ancestors been in a concentration camp/prison?

My Uncle Jimmy was in a Japanese prisoner of war camp in Burma for 3 years. The Japanese ignored the Geneva Convention frequently executing prisoners in front of other prisoners for trivial matters on the say so of the camp commandant. The Japanese didn't speak any English so they had to learn Japanese to communicate. At role-call their camp no had to be given in Japanese. They worked ten hours a day building railways with their bare hands on a diet of soya beans and seaweed and one in three prisoners died of starvation. Others diseases were common like cholera. He survived and lived into his early 70,s.