I recommend you read this article to see how Jews feel about Corbyn:
https://medium.com/@rob.mindell/three-reasons-why-a-corbyn-government-would-threaten-jewish-life-in-britain-cbe20cbd813dThe article sets out 3 reasons why Corbyn is a threat to Jewish life in Britain.
1. Corbyn’s threats to cut of trade with Israel threatens Jewish access to a main supply of kosher food. Corbyn supported boycotts of Israeli goos. Labour at it’s 2019 Party Conference adopted a policy singling out Israel as a country with which Britain should not trade
2.The Jewish community needs a government it can rely on to provide protection. Corbyn has never provided assurances of protections. In 1994 Balfour House, a Jewish community building. In the years thereafter Corbyn has campaigned for the release of the bombers
3.As a backbencher Corbyn invited many sworn killers of Jews to Parliament. He spoke at rallies and conferences side by side with those who would diminish the horrors of the Holocaust and use those horrors to threaten the supporters of Israel. The Labour Party has seen its membership rise along with a rise in in anti-Semitic incidents. Labour Party functions include statements of “conspiracy theories about money, power, and control by Jews to persecute others.”