A future Labour authorities ought to put together for resistance from world firms and will face a run on the pound, Momentum's founder says.
Jon Lansman, who heads the Jeremy Corbyn help motion, mentioned world elites would resist the "significant transformation" deliberate by Labour.
And he mentioned he hoped that it could not result in the devaluation of sterling.
He was chatting with BBC Radio four programme Long March of Corbyn's Labour to be broadcast on Monday.
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''We wish to make a important transformation. We need choices which have an effect on jobs and livelihoods democratised. The world firms will resist," mentioned the veteran left-wing activist.
"Other governments have confronted challenges like runs on the pound. And we could face comparable issues. I hope we do not.
"The people who are opposed to what we want to do have one thing in their favourmoney. We have people. We need the power of people to overcome the power of money."
Shadow chancellor John McDonnell raised a comparable prospect at a fringe assembly at Labour's convention final yrhowever clarified that he was planning for a variety of situations, and did not assume this may occur.
In the identical programme, shadow communities secretary and joint election co-ordinator Andrew Gwynne strikes a completely different tone.
He says he has had "sleepless nights" worrying whether or not native councils will be capable to ship a few of "the big ticket" objects in Labour's manifestosuch because the pledge to ship a million extra properties over 10 years.
And he warns, in an extract of the interview to be broadcast on Saturday on BBC Radio four's Today programme, that a Labour authorities that disappoints its new members may "fall at the first hurdle".
"Some issues are going to take time and we have to talk that now in opposition.
"If we come to energy on the again of large optimism, a new method of doing issues, and we fall on the first hurdle then it will likely be very troublesome to get better.
"We need a clear plan."
The Long March of Corbyn's Labour will be heard on Monday night at 2000 BST on Radio four, repeated on Wednesday, 27 June at 2300 BST.