//Even St Tony has recognized the problem?//
Blair, and just about all of the MPs who are involved in this, have been opponents of Corbyn from the very beginning and have been tirelessly trying to oust him ever since he became leader. They're intelligent professional politicians using this as a weapon against an opponent.
The only examples I have seen of jew-hating in Labour/Momentum (the leader of which, by the way, is Jewish) have been tweets - i.e. of unverifiable provenance, and realistically beyond the remit of the leadership's control. Likewise, all the articles I can find claiming to be authorities on Labour anti-semitism (such as the one linked below) speak in innuendo and lack specificity, or confuse anti-Zionism with jew-hating.
Are there any really concrete examples of this which have come to light?
http://www.politics.co.uk/comment-analysis/2018/03/26/i-ve-spent-three-years-documented-anti-semitism-in-labour-an