Dave,
You have made it quite clear that it is your belief and cannot back it up with any facts.

You have had lots of facts.
Numerous suspensions.
The statement last week from Baroness Royale.
Statements from numerous prominent people including Sadiq Khan, Tom Watson, the current and former leaders of Scottish labour, and the "entire NEC" which includes Corbyn himself.

Labour has a serious problem with anti-Semitism, while other parties do not.
That is a fact, and is the full answer to your question.

Do you believe they are all lying Dave?
Do you have any evidence to justify dismissing any of them Dave?