"One worker was hit numerous times by Matamata, including an assault with a stick, a power cord and a broom."
Walker said another complainant had his head smashed on the side of a table multiple times by Matamata, and also had a pair of secateurs embedded in his arm after they were thrown at him by the accused.
The prosecution alleged Matamata's claims of formalising working visas for staff also never materialised, which rendered one victim both an illegal worker and an overstayer.
Walker said when one man wasn't at work he would be kept behind a "padlocked perimeter fence" and was not allowed to talk to workmates or fellow worshippers at church on Sundays.
He said Matamata's status as a Samoan chief, or matai, meant his workers were not inclined to complain.
"A matai is someone who has controlling authority and commands through his title respect and obedience. Respect and obedience is a fundamental part of Samoan culture.
"For these victims there's also a cultural sense of shame over not being paid, and being ill-treated."
The court also heard allegations of how one female worker ran away after being mistreated, but was later caught by Matamata, who then drove her back from Auckland to Hastings with her wrists and ankles bound.
Walker said to prove a charge of slavery the Crown needed to show only that the accused "treated people like property, like chattels. He was using them to fill his pockets."
It's alleged the offending spanned from 1994 to last year.
Defence counsel Roger Philip said his client denied any deception, "and he denies he enslaved anyone".
He said the trial was about "an extended Samoan family and their relationships. I'll ask you to consider how the dynamics and family relationship applies".
The jury of six men and six women was sworn in yesterday.
Justice Helen Cull is presiding over the trial, which is expected to last about five weeks and involve up to 45 witnesses.