Jewish twitter users described the behaviour as “sick”, “repulsive” and “repugnant".
“Not only are they deep antisemites they are willing to go even lower in their depravity by ridiculing the horror of the Holocaust”, one wrote, before urging “Jewish Corbynites” to “wake the f*** up.”
Others mocked the Corbynite accounts, saying all of those claiming the exact same story “must be siblings”.
Some Twitter users questioned how Mr Feinstein could say that his family history enabled him to tell who was antisemitic while simultaneously choosing to retweet Sarah Wilkinson, an anti-Israel campaigner who has engaged in Holocaust denial.
Other Twitter users said they had contacted the South African, author of The Shadow World: Inside the Global Arms Trade, in order to let him know that his family story was being imitated online by bots, Twitter accounts being run by software designed to pass as humans.
Mr Feinstein responded to one account by saying “not sure how bots work but just to reaffirm that I am very real as was my mother who passed away 9 years ago, as were the 39 members of her family until they were murdered in Theresienstadt & Auschwitz.”
