Labour have lost their first councillor to the ultra-left party former leader Jeremy Corbyn recently founded with dissident MP Zarah Sultana.
Grace Lewis, 22, defected from Sir Keir Starmer's party on Friday to join the new political grouping - which at present is only a 600,000-person-strong mailing list.
Ms Lewis, a vocal pro-Palestinian voice on Coventry City Council, represents the ward of Westwood in the southwest of the city.
In a post on social media she laid into Labour's record in government, citing Sir Keir's raid on winter fuel payments, cuts to disability allowance and the party's retention of the two child benefit cap.
In the statement she said: 'Today, after 5 and a half years, I resigned my Labour Party membership. I will now serve the residents of Westwood on Coventry City Council as an Independent.
