This movie, B&W, is set in 2nd world war in England and has to do with kids being moved out of London into a camp (which looks much like a prison camp). I saw it as a kid at school movies, so it had to be produced pre 1960.
Apart from vague memories of scenes to do with kids getting from London to the camp, the most memorable scene had to do with kids bullying a Jewish kid and I think they end up crucifying him.