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Panicking Labour big beasts have issued a desperate plea to supporters to back Remain in the EU referendum .

Deputy Leader Tom Watson admitted two out of five Labour voters did not even know whether the party's official position for June 23 was In our Out.

A host of senior frontbenchers pledged to "redouble" efforts to rally supporters in the run-up to the crunch poll.

Labour voters are seen as key to the outcome – and the party has been dogged by complaints Jeremy Corbyn is not committed to the campaign.

Mr Watson, Shadow Business Secretary Angela Eagle, Shadow Work and Pensions Secretary Owen Smith and former Shadow Home Secretary Yvette Cooper today urged supporters to vote to stay in the 28-nation bloc .

Mr Watson feared the Tory civil war, which he branded a “psycho-drama”, was overshadowing the debate.

“The polls seem to say that about 40% of Labour supporters don't yet know our position. That's frustrating for us,” warned Mr Corbyn's No 2.

“We are hoping to wedge some space into this campaign so that we can talk about Labour's distinct message.”

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Labour was “about as united as it possibly can be” on Europe, he said, adding that quitting the EU would “be the end” of David Cameron .

Shadow Business Secretary Angela Eagle angrily denied the quartet were asking supporters to vote with the Tory Prime Minister and Chancellor leading the fight to Remain, and who they have spent six years attacking.

She said: “We're not asking our supporters to vote with David Cameron and George Osborne.

(Image: Matt Frost/ITV/REX/Shutterstock)

“We're saying to our supporters that the consequences of the UK coming out of Europe would be felt the most in their public services, in their right to work and in their own communities.”

Speaking at a press conference in central London, she added: “This isn't a referendum about what the Government is doing. This is a choice about the future direction that our country takes.”

The quartet singled out Boris Johnson for criticism, painting him as a figure on the “hard right” of the Tory Party.

Six Labour activists wore blond wigs and Boris masks as they handed out copies of a spoof Tory Brexit Budget.

The four senior Labour MPs claimed Brexit would see Mr Johnson and fellow Tory Outers Michael Gove and Priti Patel seize control of the Government, paving the way for a fresh assault on welfare and public services to plug a Brexit-created financial black hole .

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Welfare spokesman Mr Smith warned they would “go after disabled people and further cuts to in-work support for low-paid workers” as they “double down” on austerity.

He said: “Look at who's in charge of the Brexit campaign. These are people who are even more gung-ho about cutting workers' rights and imposing the sort of austerity we have been talking about,” said

“You're tempted to say, 'You ain't seen nothing yet'.”

Former Labour leader Ed Miliband also waded into the debate, saying in a speech: "We need to stay in the EU not for David Cameron , but for you and your family and to make it possible for us to build the fairer society we believe in."

(Image: Getty)

Backbencher John Mann r evealed he would vote to Leave , highlighting the pressure high immigration places on Labour heartlands.

But MP Khalid Mahmood switched sides and defected from the Leave campaign, pledging his allegiance to Remain.