The Jewish Labour Movement called for Mr Williamson's suspension last summer but the party did not until this February, when the Derby North MP was had the whip withdrawn for saying at a Momentum event the party had been “too apologetic” over antisemitism.
The Board of Deputies recently commended Momentum for a video on the “problem of antisemitism on the left”, but said that “clearly, the Bedford and Ramsgate branches have not received the memo”.
A spokesman said: “Inviting Chris Williamson MP to speak is a calculated V sign to the Jewish community.
“This is a man who was suspended over antisemitism having baited the Jewish community multiple times.
“We expect Momentum explicitly to tell its branches not to invite speakers who have been suspended by the party – something they should already know and understand.”
Momentum has been approached for comment.