Don't think it's been mentioned here, but on the more thoughtful end of things from a few months ago (at least in the context of 'people who actually care about what happens in the Labour Party'):
Matt Bolton and F H Pitts.
https://www.newstatesman.com/politics/uk/2018/03/combat-left-anti-semiti... change-way-it-sees-world
If like me you have a natural revulsion to the NS, FH Pitts wrote this, which is about machine-fragmentism (Virno, Gorz, Demanding the Future, Mason, Bastani) and is pretty good.
https://www.tandfonline.com/doi/abs/10.1080/03085147.2017.1397360 (academic site but open access PDF).
There's a response to it from the New Socialist, which afaict is mostly pro-Corbyn mostly Leninists, but for a pro-Corbyn/Labour publication it's the most critical one (i.e. unlike Novara which is completely uncritical of Corbyn and the rest of the shadow cabinet, preferring to take selfies with Emily Thornberry, or call pro-Iraq-war, pro-Modi, pro-immigration controls Barry Gardiner 'the people's gardiner').
Well there's two things going on (more than two of course):
1. Right wingers (Jewish or not) trying to frame any criticism of Israel as anti-Semitic
2. Labour figures responding to any accusation of anti-Semitism existing in the Labour Party as 'Tory/establishment smears'.
The latter has slowed down recently a bit, but last year and the year before it was all over the place.
Paul Mason can usually be relied upon to be all over the fucking place, so as an example:
September 2016:
If there’d been 1 incident of anti-semitism, misogyny or threats in 6 months of C4 undercover rushes, they would have shown it. Surely?
And another one:
https://www.huffingtonpost.co.uk/entry/jeremy-corbyn-supporters_uk_57da7a5ce4b0d584f7eff173"I see what they’ve done all over the summer. The spurious allegations of harassment, the spurious allegations of anti-Semitism, the spurious allegations of sexism, all designed to drag Labour’s image down so that the polls tank. That’s what the Right in Labour is up to..... You show me a single Corbyn supporter who has been convicted of harassment, convicted of anti-Semitism. Show it to me.”
March 2018:
[url=https://twitter.com/paulmasonnews/status/980077401442054145]Good, well reasoned argument about why Labour must fight rising antisemitism & its reflection inside party ...
March 2018:
https://www.thejc.com/news/uk-news/bbc-newsnight-presenter-paul-mason-ex...
April 2018:
That’s the bigger story behind wave after wave of smears unleashed against Jeremy Corbyn - even if you accept, as I do, that he is an imperfect politician and that Labour has specific challenges with anti-Semitism, which it has handled badly.
So in 2016 we get grandstanding, "show me the anti-Semitism! Where is it?!?!?1", in 2018 it's "well I definitely accept that Labour has a problem with anti-Semitism and hasn't handled it very well, but..." and also "someone added me to a facebook group with people I know in it, where there was a tonne of anti-Semitic content being posted, but I never check the group so didn't see any of it"
\ - of course I doubt there's an admission that Paul Mason handled the accusations badly in the first place back in 2016 in any of this.
An analogy would be someone says:
"The libcom forums have a problem with Islamophobia, one person on there went on to join Generation Identity and they published something by a UKIP member".
You could respond by saying that this is a smear! where's the evidence! etc., but then someone could point to this thread where Kingzog was pushing Islamophobic conspiracy theories for a couple of pages, and we recently found out he joined Generation Identity since. http://libcom.org/forums/news/migrants-sexual-violence-19042016
Now in that thread everyone was arguing with him, then he got banned, but nevertheless the comments are there and could be screenshotted by someone making that accusation in bad faith.
You could also show him here happily talking about left communism, Chartism and Bernie Sanders less than a month before he was banned:
https://libcom.org/blog/towards-anarchist-perspective-2016-primaries-250... or his posts in 2012 about Andrew Kliman and value theory: https://libcom.org/forums/theory/some-critical-remarks-klimans-propositi... - so not a random person who joined and immediately started throwing racist shit around, but someone who posted on the site for years quite happily prior to that happening (I haven't gone back through their posts to look for early warning signs).
Or for that matter that we published something from a former Class War member who went on to join UKIP: http://libcom.org/library/british-islamism-towards-anarchist-response-pa... (of course it was published to be argued against, but the accusation in itself would not be false).
Or on anti-Semitism itself there's still posts around accusing libcom of siding with holocaust deniers because we removed a post about Gilles Dauve's dad: https://antigerman.wordpress.com/2010/01/05/gilles-dauve-jean-barrot-guy... and host https://libcom.org/library/auschwitz-big-alibi (some background on all that from the old John Gray site: https://libcom.org/library/john-gray-introduction-question-state).
So to deal with bad faith accusations around stuff like this properly, you'd need to be able to point people to what actually happened, what action was or wasn't taken, whether something could have been done better, not just dismiss the entire thing as right wing smears - and this can build trust for when something is just completely made up or taken out of context.