Jim,
Theuy ghave no evidence of antisemitism in the Labour Party - end of story
If they had evidence they would have produced it long ago -

We did.
The evidence is that the leadership, the NEC, Sadiq Khan and many others within the Party acknowledge that it is true.
Many have been suspended for it, and at least one has admitted making anti-Semitic statements born of ignorance.

Why would they all lie. It harms the Party
Have you any evidence that they are all lying to harm the Party?