Wikipedia articles have been edited anonymously from the US House of Representatives. This and other articles imply that these edits are being made by one House staffer, but I don't believe it's possible to tell if many staffers are involved.
... tried to claim Cubans were behind the attempt to discredit the Apollo 11 moon landing, but that they also edited posts about the following:
The Freemason temple in Washington DC
“Lizard People” theorist David Icke
Lyndon LaRouche and his staffers
Alex Jones (who may be, according to this staffer, a Russian agent)
RT reporter Abby Martin (who is apparently “not a real journalist”)
The New World Information Communication Order