I have now read the article cited twice, whilst I understand his arguments he is clearly not a UK voter.

The furore over 'anti-Semitism in the UK Labour party' was largely an internal matter in the Labour Movement, with very little agreement and a "fudge" at the end. Before Jeremy Corbyn became the Labour Party leader the internal pro-Israeli lobby dominated; now their opponents are a significant minority and believe there is a substantial part of the electorate who support them. Those who do not support the Leader are either quiet or plan to leave. Others naively think the Leader will change "his spots" when Labour wins a General Election.

Foreign policy, with the exception of Brexit, is not an electoral priority and for this Labour Party winning the election comes first.

Yes many opponents of Jeremy C. have referred to his past support for terrorists and other "far left" causes. This "mud-slugging" has had little effect on the electorate so far. The details of intelligence sharing have been mentioned by a few. Jeremy's appeal is to a sizeable part of the electorate, a good number of whom think he is "new" and is actually a socialist - which the Labour Party wasn't. Polling suggests outside London and a few cities Jeremy's appeal is very limited, especially when so many 'traditional' Labour voters supported Brexit - an issue on which he'd prefer not to talk about.

Is Jeremy C. a 'terrorist threat to the Western World' as shared intelligence may no longer be safe. How much "raw" secret intelligence is actually given to senior ministers? It is difficult to see him following current UK national foreign and security policy. A more likely and significant step by Prime Minister Jeremy C. IMHO would be to end the patrolling of the UK's SSBNs. He has been a life-long advocate of nuclear disarmament after all.

Does that make him a 'terrorist threat to the Western World'? No, it does not. The "times are a changing" and he could be elected as Prime Minister. Somehow I doubt he shares the conventional 'establishment' view on the terrorist threat, let alone it's causes. President Trump actions have continued the slide in public support for the USA; I know the US Embassy here states this is not reflected in polling data.

He would be a threat to the usual Anglo-Israeli relationship, but that is not the 'Western World' as much as the author thinks it should be. An anti-Israel stance might actually gain him more votes in the big cities and ensure the non-Labour left work hard to support his election.

Anyway this is a strange question given the indications that President Trump reportedly neglects his communication security and the report he has already given away secret information on an Israeli operation against ISIS (which was subject of a post on a thread awhile back).