The Auckland Council's security bill in evicting the Occupy protesters included a $38,000 payment to a firm that has previously spied on activists.
Documents obtained under the Official Information Act show some of the council's $126,673 security costs at Aotea Square and other sites included a payment to private investigators and security firm Thompson & Clark. The company was one of three security firms the council hired to manage and evict the protest.
Council spokesman Glyn Walters said Thompson & Clark was not employed for covert surveillance of the Occupy group, which camped in Aotea Square, Queen St and Victoria Park as part of an international movement against corporate greed.
Asked why the council hired Thompson & Clark as well as more conventional security firms, Mr Walters said it needed to increase the number of guards at the site.
Thompson & Clark removed four truckloads of camping gear and equipment after the protest was shut down.