Gama Construction has been accused of "starving" protesting Turkish workers into submission in their dispute over pay and conditions.
The claim by Socialist Party TD Joe Higgins was denied by the company, which defended its decision to remove a number of workers from its payroll and to ask them to vacate their accommodation.
Between 200 and 300 workers marched yesterday from a company site at Ballymun, Dublin, to its headquarters in Santry to highlight their concerns.
Ictu general secretary David Begg
A statement issued by Mr Higgins, in the name of the Turkish Workers' Action Group, said Gama had moved "vindictively" to sack more than 300 employees engaged in a work stoppage for the past three weeks.
It said the company had stopped providing food to workers at its Ballymun site who were taking part in the stoppage and, "disgracefully", was threatening to evict them.
Leaders of unions at the company have decided to seek meetings with Minister for Employment Micheál Martin and Minister for Social Affairs Seamus Brennan to seek State support for the workers concerned.
Gama has denied threatening evictions, but says about 230 workers are being taken off its payroll and asked to leave their accommodation.
All 230 had jobs "to return to in either Ireland or Turkey and are refusing to do so," the company said in a statement. "They can return to work and resume their employment at any time but have refused to do so."
Later today, the Irish Congress of Trade Unions called on the Government to aid the Gama workers who claim they have been denied pay, food and accommodation by their bosses.
David Begg, general secretary of ICTU formally asked Employment Minister Micheal Martin to provide the Turkish men with "emergency social welfare payments and accommodation" until the situation has been resolved. The formal request was made in consultation with SIPTU, which represents the workers.
SIPTU officials believe that Gama has removed some 350 workers from the payroll, stopped their food supply and said they are to be evicted from their accommodation on Friday.
In a letter to Mr Martin, Mr Begg said today: "This presents an appalling vista of people being left homeless and destitute in a foreign country."
"Given the urgency of the situation, I would appreciate if you could act on this request as quickly as possible," continued Mr Begg, who has been in contact with the Government on this issue throughout the day.
A copy of the letter has also been dispatched to Social & Family Affairs Minister Seamus Brennan.
Additional reporting PA