Labour members at the party's conference have voted in favour of a motion calling for ministers to reverse their cut to the winter fuel allowance, in an embarrassing blow to Sir Keir Starmer.
While there is nothing binding about the vote, it puts further pressure on the Labour leadership over its controversial decision to take away the benefit from millions of pensioners.
The motion was put forward by the trade union Unite, which has accused the government of embarking on "austerity mark two".
Sharon Graham, the general secretary of Unite and outspoken critic of Sir Keir, moved the proposal by quoting Labour's election winning post-war manifesto, which she said was "one of hope".
She said: "The nation wants food, work and homes... It wants a high and rising standard of living, security for all, against a rainy day..."
"Friends, that's a quote from the 1945 Labour Manifesto, written in the shadow of death, destruction and debt, caused by years of war. A manifesto of hope."
Ms Graham said debt then was "nearly three times higher than it is now" but there was "no mention of cuts, no mention of austerity and certainly no mention of making everyday people pay".
She added: "I do not understand how our new Labour government can cut the winter fuel allowance for pensioners and leave the super-rich untouched.
"This is not what people voted for. It is the wrong decision and needs to be reversed."
Are you honestly proposing that an increase in cold related deaths beyond expected levels during a cold snap is more likely to be explained by thousands of OAP's just happening to forget to turn the heating on, rather than them not being able to afford it?
No, I'm suggesting that any death will be announced as an attempt of the government to murder the elderly.
As it always has, and always will be.
Ok, why aren't the papers already full of those stories then? Old people die all the time. If the stories are guaranteed regardless of the governments actions, why are you bothered about the optics at all? They're going to be the same no matter what.