Keir Starmer will warn online agitators are trying to stir up a "poisonous belief" that violence is coming to the UK in a major speech.
The Prime Minister will say fears are being stirred in order to ramp up a "coming struggle". He will describe "an industrialised infrastructure of grievance... created through our devices".
Mr Starmer is expected to say: "That is miserable, joyless, demonstrably untrue, and yet, in another way, totally cohesive. That preys on real problems in the real world, identifies clear enemies - that's us.
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"And, at its heart, its most poisonous belief, on full display at the protests here in London just a week or two ago, (is) that there is a coming struggle, a defining struggle, a violent struggle, for the nation - or all our nations."
It comes after far-right rabble rouser Tommy Robinson claimed after a rally which attracted more than 100,000 in London that "the spark has started, the revolution is on". Elon Musk appeared via video link claiming that violence is coming and call on supporters to "fight" or "die".
The Prime Minister will warn of "a language that is naked in its attempt to intimidate". He will set out a choice between "a politics of predatory grievance, preying on the problems of working people" and "patriotic renewal, rooted in communities, building a better country, brick by brick, from the bottom up, including everyone in the national story".

Writing in The Telegraph, Mr Starmer said it is now "essential" to tackle "every aspect of the problem of illegal immigration". He will tell the Global Progress Action Summit in London that relying on migration to plug workforce gaps "is not compassionate left-wing politics".
He said left-wing parties have shied away from talking about immigration - but said it is possible to be concerned without adopting Reform UK's "toxic" approach. He wrote in the newspaper: "There is no doubt that for years left-wing parties, including my own, did shy away from people's concerns around illegal immigration.
"It has been too easy for people to enter the country, work in the shadow economy and remain illegally. We must be absolutely clear that tackling every aspect of the problem of illegal immigration is essential."
The Prime Minister will announce the rollout of mandatory digital ID cards, which he says will crack down on those working illegally. He is expected to argue "the simple fact is that every nation needs to have control over its borders".
"For too many years, it's been too easy for people to come here, slip into the shadow economy and remain here illegally," he will state. He will add: "It is not compassionate left-wing politics to rely on labour that exploits foreign workers and undercuts fair wages. But the simple fact is that every nation needs to have control over its borders."
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