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The pair did not retweet anything. Here is the initial news story - https://www.theguardian.com/society/2019/feb/21/rachel-riley-and-tracy-ann-oberman-to-take-legal-action-after-twitter-abuse-antisemitism.
This is about the claims of Labour being anti Semitic, not the niether are members of the labour party.Note that they used the same lawyer that Jack monroe used it what was one the easiest defamation case, that bankrupted financially the morally bankrupt Katie. Lawyer also a vocal anti corbinite. Note the lawyer was even fined for lack of integrity for replies to his opponents. More in the article.
Riley wore the t shirt on twitter claiming the Corbyn was a racist..https://www.standard.co.uk/news/uk/photographer-hits-out-at-rachel-riley-for-wearing-tshirt-using-an-illegally-manipulated-version-of-his-jeremy-corbyn-picture-a4297041.html
https://www.theguardian.com/politics/2020/jul/29/rachel-riley-and-tracy-ann-oberman-drop-libel-claim-over-retweet was the case, they original article of the deleted retweet seems to be around and available still. Note that there was insurance paying for this defamation and that may have been force to stop the prosecution.
It's quite dangerous that you have an 'intelligent' celebrity like Riley, who's been awarded and MBE and contributes to an NGO combating digital hate and misinformation, spitting her own digital hate and misinformation on Twitter.
She's had her slap on the wrist, given a half-baked apology along with a woeful excuse - so life will probably go on. If someone said something that mildly seemed anti-Semetic [as a Semetic-language speaker, I despise this hijacked term], I'm sure things would be very different.
Not sure what she and Oberman retweeted, but yes, there are so many B-grade celebs retweeting the most vile of Arab/Palestinian-hate going unchecked, largely because it's currently in vogue in politics to excuse our white, European, colonialist allies for genocide.