The refusal of three GCSB staff to cooperate with a police investigation into the bureau's illegal spying on Kim Dotcom will further erode public confidence in the electronic eavesdropping agency Labour says.
Police this week released a summary of their investigation of Green Co-leader Russel Norman's complaint about the illegal spying which was revealed Inspector General of Intelligence and Security Paul Neazor a year ago.
Announcing their findings three months ago, the police said the GCSB's spying was illegal but as GCSB staff did not act with criminal intent, no one would be held accountable.
However the summary noted that three current GCSB staff refused to be interviewed by police.
Dr Norman said one of those staff "appears to have played a crucial role in the GCSB's actions in this case, yet police didn't pursue this any further despite the seriousness of this matter".