"He undermines Jeremy Corbyn's statement of intent to do more to tackle antisemitism."
She also recalled Mr Loach's decision to stand for his own Left Unity party in 2014 against official Labour candidates - securing an average of 3.2 per cent of the vote wherever they stood.
In the strongly-worded article, Ms Berger added: "As a Jew I defend my right to speak at rallies against antisemitism."
Accusing Mr Loach of aiding the Tory local election campaign with his speech to Labour supporters in Kingswood, Bristol, Mr Berger said every one of the 40 MPs who attended last month's demo in Parliament Square "will always challenge all forms of racism, no matter where they appear”.
Ms Berger said Mr Loach “adds to the problem” by "dismissing" concerns over antisemitism in Labour.
