I left of my own accord, but I recall v clearly the message Labour gave that my politics were not wanted. If I hadn't been anonymous on social media, Asaf Kaplan (ex IDF Unit 8200 cyber spy-cum Starmer's employee) would have expelled me.
https://www.middleeastmonitor.com/20210130-what-is-a-former-israeli-spy-doing-in-the-british-labour-partys-head-office/
What I can't fathom is why a mild Social Democrat like Corbyn was such a threat to the UK, compared to corrupt Russian asset chaotic supermarket trolley Johnson or Brexit means Brexit Theresa May.