Over 5,000 staff at Dunnes Stores are voting on whether to go on strike over pay and conditions at the company.
Their trade union Mandate says Dunnes has refused to implement a recommendation by the Labour Court to meet with the union.
But in a letter circulated to 14 thousand staff last week - Dunnes says it has no obligation to recognise trade unions.
The letter also says any harm caused to the company "can only cause redundancies and layoffs."
Assistant General Secretary of Mandate Gerry Light says the workers demands are simple;
