Greenpeace USA headed to court in North Dakota on Monday, as a trial expected to last about five weeks begins over protests at the construction site of Energy Transfer's (NYSE:ET) Dakota Access Pipeline that delayed the $3.

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.

”Freedom of speech is on the line,” says Waniya Locke, a member of Standing Rock Grassroots. “This directly impacts everybody, not just Standing Rock, not just Greenpeace.”