The group is unhappy with what they say is discrimination in pay rates for workers building the centre.
Landowners have also complained that most contracts for building and supplying the centre have gone to Australian companies.
The Immigration Department said locals are engaged by and paid in line with PNG's Department of Industrial Relations rates.
And it said that at least 10 Manus Island companies provided goods and services to the centre, with locals encouraged to apply for upcoming construction jobs.
Watch: The full report above.
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