The Chancellor has branded Nigel Farage’s agenda the "single greatest threat" to British people’s livelihoods as her Labour conference speech was interrupted by a pro-Palestine protester.
Rachel Reeves accused the Reform UK leader of pushing “falsehoods” and “easy answers”.
It comes as polls show Mr Farage is on course to be Prime Minister, with his party overtaking Labour with voters.
"The single greatest threat to our way of life and to the living standards of working people is the agenda of Nigel Farage and the Reform party,” Ms Reeves told the annual political conference in Liverpool on Monday.
"Whatever falsehoods they push, whatever easy answers they peddle, however willing they are to tear communities and families apart, they are not on the side of working people.”
"This is a fight that we must win, and it is a fight that we will win," she added.
Ms Reeves said she "fundamentally" rejects the Conservative and Reform UK position that the economy is broken.
"The Conservatives and Reform they want you to believe that our economy is broken, that our best days lie behind us, the decline is inevitable,” she said.
"I fundamentally reject that. It's not the country I see around me, not the future that I believe in.
"I know that things are still difficult, bills are too high, getting ahead can feel tough, and there are still too many obstacles in the way for businesses.”
Less than 10 minutes into the Chancellor's speech a pro-Palestine activist, identified as Sam P, stood up with a large Palestinian flag and shouted: “Labour is complicit in the mass starvation of Palestinians”.
Ms Reeves defended her party’s approach to the war in Gaza before resuming her speech as the crowd drowned out the demonstrator.
Ms Reeves said: "We understand your cause and we are recognising a Palestinian state.
"But we are now a party in Government, not a party of protest.”
Ms Reeves vowed to "take no risks" with the trust of the British people amid rumours she is planning tax rises in her upcoming Autumn statement to help plug a £40billion blackhole in the public finances.
She told the conference: "I will make my choices at that Budget.
"They will be choices to take our country forward.
"And whatever tests come our way, whatever tests come my way, I make this commitment to you: I will take no risks with the trust placed in us by the British people."
She pledged to deliver an approach of "secureonomics", as she began her Labour Party conference speech.
"I promised you we would run the economy differently,” she said.
“No longer would we turn a blind eye to where things are made and who makes them, or shrug our shoulders when the national interest is on the line, because a strong economy must rest on strong foundations.
"I call that approach securonomics."
