Sealord workers in Nelson are urging iwi to step in over working conditions at the company's seafood processing plant.
Labour Party Maori Affairs spokesperson Parekura Horomia says Sealord recently made 160 workers redundant and now wants the remaining staff to accept significant reductions in their pay and working conditions.
He says he expects better from the half iwi-owned company, which employs mostly Maori workers.
Mr Horomia says iwi leaders who are managing shares on behalf of tribal members should stand up for workers' rights.
The Maori Party says it is appalled at the prospect of further changes in working conditions.
Sealord has been unavailable for comment.