Bury South? Earlier you made the claim that the constituency had never voted Conservative.
The constituency was created in 1983 from parts of other constituencies and the first MP in 1983 (and up until 1997) was Conservative.
Between 1997 and 2019, Bury South was Labour.
In 2019 the sitting Labour MP, Ivan Lewis, did not contest the election and did indeed recommend that people vote Conservative.
However, if you have a look at the results that didn't really have any effect.
In the 2017 election the losing Conservative candidate got 41.6% of the votes in Bury South. In 2019, the successful Conservative candidate got 43.8% of the votes.
That is hardly evidence of a mass swing of "the Jewish community". What did happen in Bury South, along with the 54 other constituencies that Labour lost, was that there were new parties coming along taking their vote. For example, in Bury South, the Lib Dems, the Greens, even the Brexit party all saw an increased share of the vote at the expense of Labour.
You can also look at the neighbouring constituencies Bury North, Bolton North East and Heywood & Middleton where very much the same thing happened in each case. The Conservative vote stayed about the same but the Labour vote fell a lot.
In the case of Bury South, there is a sizeable Jewish population (the 2021 Census says 16%) but that doesn't apply to those other constituencies I mentioned like Bury North which is 13% Muslim and 0.6% Jewish. Bolton North East is 18% Muslim and 0.1% Jewish. Heywood & Middleton is 11% Muslim and 0.1% Jewish.
All of these adjacent constituencies in and around Bury and Bolton all flipped from Labour to Conservative in 2019. In all of these seats the Conservative vote only increased a little but it was other parties like the Lib Dems, the Greens and the Brexit party that also had increases at the expense of the Labour party.
I think that blaming the 2019 result in Bury South on "the Jewish community" is slightly misunderstanding what was happening back then.