The environmental group is being sued for $300 million in North Dakota by a pipeline company in a case that has become a flash point in the debate over free speech.

A US oil pipeline operator's lawsuit seeking millions of dollars from Greenpeace for allegedly orchestrating a campaign of violence and defamation begins Monday in a North Dakota court, in a

Energy Transfer says Greenpeace used tactics including defamation, vandalism and harassment in an attempt to tarnish the company’s reputation and sink the Dakota Access Pipeline project.