The Council of Trade Unions is backing the Maritime Union's campaign to save jobs at the Port of Napier.
Workers have downed tools this morning to protest the potential loss of 85 jobs.
It follows a decision to change contractors, without securing employment protection for current workers.
CTU spokeswoman Helen Kelly says the workers are not disposable units that can be tossed about in the pursuit of a quick buck.
She says the impact of a change of contract on these workers would be incredibly severe.
Kelly says the long serving dock workers on the Port of Napier deserve better.