Labour leader Sir Keir Starmer (Photo: Ian Forsyth/Getty Images)
The whistleblowers, who were all members of Labour Against Antisemitism, claimed the party breached their data protection rights and left them open to vicious online attacks including chilling “calls to action” from neo-Nazi groups.
In a separate case, 21 claimants are suing the party for breaching their data protection rights and for defamation.
The JC previously reported that Labour had called in an independent mediator to try and find a way of ending the litigation.
Legal experts have said the series of cases could cost millions in costs and payouts were it to lose them.
Mediation sessions with the groups of claimants were understood to have taken place over the next few weeks in the hope of reaching a settlement.
The Labour party have been approached for comment.