A labour group says Samsung Electronics is facing a lawsuit from Brazil's government seeking damages over poor working conditions at the company's assembly lines.
Samsung said it will cooperate with Brazilian authorities.
Reporter Brasil, a labour rights group, said on its website that Brazil's labour ministry found "serious" violations including up to 15 hours of work per day and insufficient breaks at Samsung's Manaus factory.
The group said the lawsuit is seeking 108 million US dollars (£69.9 million) in damages.
The South Korean company was prosecuted in Brazil in 2011 over poor working conditions. It has also been accused of hiring children in China and faced a flurry of lawsuits in South Korea from workers seeking compensation over health hazards at its factories.