The President of the Irish Congress of Trade Unions John Douglas has joined workers occupying the premises of the Paris Bakery in Dublin's Moore Street, which closed suddenly on Tuesday.
Mr Douglas, who is also General Secretary of the Mandate Trade Union, is one of around 15 people who have occupied the premises in pursuit of money, which they say is owed to the employees.
Around 14 workers are owed wages and entitlements totalling around €55,000.
It is understood around six gardaí are also on the premises.
A spokesperson for the occupiers said the Paris Bakery had locked them out.
It is understood they are receiving support from the Mandate Trade Union and the Migrant Rights Centre of Ireland.
It is understood the company which previously employed up to 70 staff has moved to a new location in Balbriggan.