LABOUR MPs and activists split with the supposedly cross-party Vote Leave campaign last night over concerns it is being dominated by a hard-right clique.

Labour Leave formally disaffiliated from the group to pursue an independent left-wing campaign to leave the EU.

Labour Leave co-chair Kate Hoey MP also confirmed she will not support Vote Leave’s bid to be designated the official out campaign by the Electoral Commission.

The group said in a statement: “Labour Leave will be campaigning with all grassroots campaigns who share our belief that the UK has a better future outside of the EU.”

With only two of 17 seats on Vote Leave’s governing board, Labour Leave were concerned they were being sidelined by its right-wing leadership.

Taxpayers’ Alliance founder Matthew Elliott is the chief executive, while campaign director Dominic Cummings is a former adviser to Tory Justice Secretary Michael Gove.

This week’s decision to replace Labour Leave founder John Mills as chairman with Tory peer Lord Lawson was the final straw for the group.

Leaked emails reveal that Mr Mills was demoted just a day after warning Mr Cummings that he was “generating more and more ill feeling.”

Mr Mills, who is expected to remain as deputy chair of Vote Leave, told the Star that the demotion would free him up to reach out to Labour voters.

But a Labour Leave source said their position in the umbrella group had been made “very difficult” by the decision.

“All the MPs have had enough,” the spokesperson said. “They want to campaign independently.”

Green peer Jenny Jones also quit Vote Leave in protest yesterday, writing on Twitter: “Will vote to leave EU but can’t work with an organisation with so little judgement as to put Lawson at its head.”

The Britain Stronger In Europe campaign said the splits were a “hammer blow to the Vote Leave campaign’s hollow claims to be cross-party.”

Labour leader Jeremy Corbyn will say today that he’ll make the case for a “real social Europe” during the referendum campaign.

He will say: “Our party is committed to keeping Britain in the EU.

“But we also want to see progressive reform in Europe: democratisation, stronger workers’ rights, sustainable growth and jobs at the heart of economic policy, and an end to the pressure to privatise and deregulate public services.”