Union leaders are to call for a major shake-up of the banking sector to tackle concerns over lending, executive pay and the UK's slow recovery from recession.
The TUC will press for a series of changes at its annual congress next week, including a state investment bank, greater diversity in the banking system and a crackdown on bonuses.
The union organisation will also press the case for worker representation on company remuneration committees.
The TUC General Council will issue a statement at the Brighton conference, which begins on Sunday, saying that the Government's Green Investment Bank should be made into a "proper bank", with the ability to raise its own funds.
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The move comes amid a motion of no confidence that was tabled against Labour leader Jeremy Corbyn.
The first anniversary of the Sousse terrorist attack - which left 30 Britons dead - will be marked by families of the victims on Sunday.
Since Friday's EU result, the Liberal Democrats have recorded thousands of voters signing up to become members.