Steve,
. The trouble with your "authorities," Keith, which are myriad (you employ them routinely instead of presenting honest argument), is that you select the ones that reinforce your personal prejudices

Unfair Steve. You folks just deny that the Labour Left has had serious problems with anti-Semitism.
You would rightly dismiss my own view on the subject because, like you, I have no inside knowledge.
Instead I have quoted senior, long established and prominent Labour people who you can try to dismiss but only make yourself foolish by doing so.
They know rather better than you what is going on in the party.