Jeremy Corbyn is vowing to take on the City of London if he becomes prime minister, saying finance should be “the servant of industry, not the masters of us all”.
The Labour leader will call for a “fundamental rethink” of the finance sector and how it is regulated.
He will also promise to give the government new powers to intervene to prevent “hostile takeovers”.
The Tories said Labour would “end up harming Britain’s businesses”.
Mr Corbyn has often criticised bankers, and promised a “fundamental shift” in economic policy if he wins power.
In a speech to the EEF manufacturers’ organisation on Tuesday, he will say his administration would be the first in 40 years – a period which includes 13 years of Labour government – to “stand up for the real economy”.