FIREBRAND John McDonnell called for an illegal general strike on his own website, The Sun can reveal.

Incendiary video footage published by the Shadow Chancellor shows him calling for a mass walk out across Britain’s infrastructure and industry – the likes of which crippled the UK in 1926 and was later outlawed.

3 John McDonnell calls for general strike in incendiary video Credit: Getty Images

Mr McDonnell said Brits would have nothing to fear from all trade union members refusing to work, raging: “At some time stage, we’ve got to come out together.”

He added: “If that means a general strike then let’s do it, what are we afraid of?”

In an angry rant he also aimed fire at fellow Labour MPs urging them to “stop fiddling your expenses and start standing with us”.

3 Priti Patel says John McDonnell will bring chaos to the economy Credit: Fame Flynet

Footage of the speech from May 2009 was published on Mr McDonnell’s own personal blog and was still accessible despite him campaigning to win the keys to No11 next month.

Strike laws in the UK mean industrial action must be as a result of a direct dispute between employees and their bosses.

Sympathy striking — where unions walk out together — was outlawed by Employment Act 1990.

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Economists say Mr McDonnell’s planned action would wipe £4billion of the British economy for each day of action — sending the UK’s finances into a tail spin.

The Institute of Economic Affairs said “the whole economy would quickly grind to a halt”.

Their Chief Economist Julian Jessop said: “This would be worse than the impact of a Bank Holiday, because a general strike would be unexpected and deliberately arranged to cause disruption.

“People can also still travel and spend on Bank Holidays, whereas they wouldn’t be able to do so during a strike if railways and shops were closed,” he added.

3 Senior Tory David Morris says the people should reject Labour's hard left agenda Credit: Photoshot

A Tory Cabinet Minister accused Mr McDonnell of being a “Marxists who wants to bring down the state”.

Priti Patel blasted: “Whether in opposition or in power, John McDonnell is determined to bring chaos to the economy.”

And senior Tory David Morris added: “It’s frankly dangerous that Labour’s prospective Chancellor could call for a general strike and claim there was nothing to fear from such economic devastation.”

The Conservative candidate for Morecambe and Lunesdale went on: “The sooner the people of Britain are given the chance to reject John McDonnell and Jeremy Corbyn’s hard left agenda, the better.”

Mr McDonnell’s spokesman told The Sun: “John was a well-known campaigning backbench MP for a number of years raising many issues such as worker’s rights.”