The start is responding to Asa Winstanley in Electronic Intifada, but it could just as equally be responding to Jamie Stern-Weiner in OpenDemocracy, Graham on Twitter, the Jewish Socialist Group or half my left-wing friends.
Basically, I have two problems with this. First, I find the whole idea of an all-powerful "Lobby" smacks of conspiracy theory thinking, which is reminiscent of right wing fantasies about "Eurabia", "creeping sharia" or "white genocide", and specifically reminiscent of old antisemitic fantasies of secret Jewish tentacular power.
Second, it requires a highly selective sampling of the recent antisemitism allegations in Labour. Some of the allegations can be dismissed or at least aren't that serious. Others, however, are harder to dispense with in this way. The list of allegations is just so long that it is unsustainable to say they don't add up to something worrying and significant. I think, as Owen Jones says, we need to really take this seriously and try to understand it.
However, I do feel that a kind of hysteria has developed around this. A few untruths, half-truths and exaggerations have diluted the authority of those calling out antisemitism. Baroness Neuberger's bizarre allegation that Militant were antisemitic would be one example; Boris Johnson's description of antisemitism as a "virus" in the party is also absurd.
And clearly the agenda of Andrew Gilligan or Guido Fawkes (those doing the muck raking) is deeply distasteful. It sickens me to hear Cameron and Johnson lecture Labour about this - not least while Lynton Crosby runs Goldsmith's dirty, dog whistle racist campaign against Sadiq Khan and Tory Brexiteers drop ominous warnings about "uncontrolled immigration".
And I'm sure there are some Labour "moderates" fanning these flames out of resentment at Corbyn. (Although the widely circulating idea that they have orchestrated this to undermine Labour's election chances next week is frankly absurd - unless you think that Ken Livingstone's motor mouth is secretly under their control.)
It's also clearly true that some of the strongest antisemitism allegations relate to people who joined long before the Corbyn win (e.g. Downing) and/ or to members who have nothing at all to do with his movement (e.g. Khadim Hussain). However, there does seem to be some overlap between the pro-Corbyn keyboard warriors and the most vociferous defenders of antisemitism. (If you look at the Twitter scene around Scott Nelson for example.) It's important to distinguish this milieu from the people who are actually active offline in Momentum - and clearly it serves the interests of both Tories and Labour "moderates" to blur that distinction - but it does disturb me, given the numerical dominance of the Corbynites in the new Labour Party.
So, I would strongly defend Labour from those who say that this stuff is "rife" in the party. It's not, contra Boris, a "virus" in the party. Most party members are appalled by it. But I do think that Labour, and the left as a whole, does have some kind of a problem with antisemitism. And it needs - we need - to face up to it.
On Corbyn: Corbyn and the Holocaust deniers
On Ken: Ken's antisemitism
On left antisemitism: Nonsense about the Jewish lobby