Unite the union is to launch a new credit union, open only members, to take on payday lenders such as Wonga.
“We are determined to wipe out rip-off payday lenders and ensure that they can’t make profits by exploiting victims of the financial downturn," Unite general secretary Len McCluskey said.
"Unite's new credit union service ensures our members can access finance without fear and helps keep them out of the clutches of parasitic lenders."
Credit unions are not-for-profit organisations offering loans, savings and current accounts to their members.
More: Who can join credit unions and how do they work?