A shank attack on three prison guards, purportedly as revenge over an incident involving notorious gangster Joshua Masters, shows the dangers of a job managing some of New Zealand's most dangerous people. Sam Hurley reports.

Two of a trio of inmates who carried out a brutal revenge attack on a group of prison guards will serve even more time behind bars.

The Herald can also reveal the three guards they

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Assaults on guards climbs steadily in recent years

Guards accused of falling foul of the law