The Jehovah’s Witnesses, a pacifist religious group, are pursuing legal action against the German government to claim a family archive that documents the Nazis’ persecution of the Christian denomination. The archive comprises 31 files of documents relating to the Kusserow family, whose members were arrested, imprisoned and murdered by the Nazi regime because of their faith. It has been held by the Museum of Military History in Dresden, which is operated by the German army, since 2009 when it was purchased from a member of the Kusserow family. A German regional court rejected the Jehovah’s Witnesses’ claim last year, saying...