The Hutt Valley Chamber of Commerce is talking to the police this afternoon about a Twitter account set up in its name.
Last night the account tweeted an image of Labour Leader Jacinda Ardern, saying she has "never had a real job" and the tag line "Let's destroy NZ's primary producers".
Similar anti-Labour messages have appeared on the account before:
The link to the twitter account was on the official Hutt Valley Chamber of Commerce website until this morning. It has since been removed.
In a statement, the chamber said it has been "the victim of a malicious trouble-maker" who was known to them, but was not part of their organisation.
Chief executive Mark Futter said: "No person in their right mind would post such material, and no reasonable person would believe we did."
The Twitter account, which Mr Futter said the chamber has no control over, was still operating this morning, but appeared to be closed this afternoon.
Mr Futter said he had spent most of the morning unravelling what has occurred, and that the chamber was paying a reputational price for the completely malicious actions of someone, and the laxness of other businesses.
He said he would discuss laying a complaint with police.