The Unite union, which represents many Barclays workers, says the bank's decision to cut up to 1,700 jobs is 'a colossal mistake'.
The union said frontline roles, including cashiers, personal bankers, operational specialists, branch managers and assistant managers will go throughout 2014.
It claimed that customer service would be affected by the changes and said Barclays risked damaging its reputation.
In a statement Barclays said fewer of its customers were using branches.
More top news
Five members of the Armed Forces have been granted operational honours and awards in recognition of their service.
The Conservative peer said he was 'shocked' that the law had been vetoed by the Liberal Democrats.
A woman who attempted to get her idol's full pout was left with hugely swollen lips when her plan went horribly wrong.