Propaganda, the spreading of ideas, information, or rumor for the purpose of helping or injuring an institution, a cause, or a person.
I believe DougE provided enough examples of the ideas, information or rumor.
The USP taking that and making a lawsuit out of it completes the definition by including the "for the purpose of helping or injuring an institution". The USP used propaganda to both attempt to injure the PGC (failed)and to furhter thier own cause (failed again). The dismissal with predjudice demonstrates that the courts held the same opninion.