Immigration New Zealand has a secret blacklist with the names of 185 lawyers and immigration advisers it claims have questionable characters.
The blacklist was discovered by an immigration adviser when she found her files had warnings attached after obtaining them from the agency under the Official Information Act.
The New Zealand Association for Migration and Investment has lodged a complaint to Immigration about the practice.
"One of our highly respected members ... was devastated to find several character alerts or warnings had been marked on the file without her knowledge," said chairman Walter Stone.
"Immigration staff had put the alerts on her file each time one of her clients had submitted a false document ... the adviser had no involvement in providing the fraudulent certificates and was completely innocent."