The ACLU, along with a coalition of public interest groups, filed a friend-of-the-court brief in support of Greenpeace and its partners and the individual Standing Rock protesters. We argued that Energy Transfer’s claims violate the First Amendment, which prohibits companies from suing critics out of existence just because their message is anathema to the corporate interests of the plaintiff. We also told the court that the RICO Act can’t be manipulated and exploited to suppress constitutionally protected speech.