Workers in Brazil brought a £7 billion Amazon dam building project to a grinding halt when they struck last week.
The 7,000 construction workers built barricades on the road leading to the site in the northern Brazilian state of Para.
The Union of Heavy Construction Industry Workers members are demanding more holidays to visit their families and a higher food allowance. They currently get just £30 a month for meals.
The dam is planned to be the third biggest in the world, after China's Three Gorges dam and the Itaipu dam on the border between Brazil and Paraguay.
The Brazilian government is pushing such massive infrastructure projects across the Amazon rainforest as part of its drive to develop the region's economy.
But the dam has been opposed by indigenous groups and environmentalists. It is expected to displace up to 40,000 people.