Wes Stretting is a jewish activist as well as a Labour MP.
He has been publish by the Labour Friends of Israel in their book 'Making the progressive case for Israel'.
So he is in fact a lobbyist on behalf of Israel.
Many People, not just Labour left, have a problem with Israel due to the country's military offensives against neighbouring people. So to some Israel is a rougue nation, a pariah state, and worthy of condemnation.
Unfortunately some with an agenda can twist oppostion to Israeli atrocities as an attack on all jews and therefore anti semitic. But it isn't, it is just calling out oppression, and legitimate criticism.
So Corbyn and the Labour Party will continue to tell our friend Israel, when it is breaking International Law, that it must stop. And that will inevitably upset the Israel libbyistsin the party, who wll then whinge to the Daily Telegraph.