The Rail Maritime and Transport Union said it will give legal assistance to the workers and also called for talks with Climate Change Secretary Ed Miliband to try to save the factory.
General Secretary Bob Crow said the union was making arrangements to get food, water and other supplies into the factory to prevent the workers from being “starved into submission”.
Mr Crow said: “The whole of the trade union and environmental movement should be proud of the courage and determination being shown by the workers at Vestas.
“This dispute brings together two crucial issues – the right to protection from companies which abuse the law to hire and fire, and the right to live in a world where the environment and sustainability are priorities.”
Hampshire Police said yesterday that two people arrested outside the factory were later released on bail.
