However, the document was subsequently leaked, exposing the personal details of hundreds of people.
According to the Telegraph, Labour is arguing that the party itself should not be held responsible for the leak. Instead, it has filed a counterclaim against five former staff members who it alleges were to blame for the document surfacing.
The paper said that at a hearing last week, Labour’s counsel warned that if the claims of the nine whistleblowers were to succeed, it could “lift the liability lid”, resulting potentially in claims by 380 people.
A further 23 claims had already been issued, the barrister was said to have told the court.
Labour was facing a bill of up to £5 million if it lost claims relating to antisemitism allegations, the Telegraph has previously reported.
The Labour Party was approached for comment.
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