Correction: An earlier version of this article said that environmental group Friends of the Earth is one of the organizations whose bylaws prohibit them from participating in acts of civil disobedience. The group has no such dictate. Erich Pica, president of Friends of the Earth-U.S., said, however, that the organization does not endorse "illegal action" during work hours and said that staff have helped the Tar Sands Blockade with web publicity.