A bitter internal feud dating back to the Jeremy Corbyn era could prove costly for Labour in the run-up to the next general election.
The UK's data watchdog has told the BBC it will not be prosecuting three Jeremy Corbyn supporters - Georgie Robertson, Laura Murray and Harry Hayball - accused of leaking confidential information.
This could have implications for Labour's ability to mount an effective general election campaign, as some in the party believe it could face a multi-million pound legal bill.
The three have been blamed by Labour, along with two other Corbyn supporters, of leaking a controversial internal party document, which included private emails and messages.
But the Information Commissioner has told the BBC it has found "insufficient evidence" that any individual had unlawfully obtained or disclosed personal data.
Separately, Labour is taking the five Corbyn supporters to the High Court for conspiring to put the document into the public domain.
But some in the party are concerned that the commissioner's decision could make the case less likely to succeed.
If it fails, lawyers for the Corbyn supporters say they will seek to recover their costs.
The party has said it is confident of the case it is making to the court.
But the stakes are high.
The BBC understands the estimated combined legal costs of the five Corbyn supporters, added to Labour's costs, range from more than 3m to around 4m.
Labour says it doesn't recognise these figures.
The case against the...
Join our lawyers for a recorded webcast as they analyze key developments in False Claims Act enforcement related to healthcare, government contracting, DEI, financial services, and trade, and offer...