In the basement of the world’s oldest archive of the Holocaust, located in a townhouse on Russell Square in London, the latest artefact to join the Wiener Holocaust Library’s collection leans against a wall. It is a metal sign that had been attached to the building’s front railings until early November when it was brought downstairs after staff arriving at work found it daubed with the word “Gaza” in red paint. “It is quite bulky so I don’t think anyone’s worked out where it is going to be stored”, said the head curator, Dr Barbara Warnock. There had been similar...