There are still credible death threats against some directors of the Cavan-based company once known as Quinn Industrial Holdings, RTÉ's Prime Time has been told.
John McCartin, a director of Mannok - formerly Quinn Industrial Holdings - was speaking on tonight's programme.
He paid tribute to the strength and resolve of his friend and fellow director of the company, Kevin Lunney.
Three men who abducted and tortured the businessman in September 2019 were yesterday handed lengthy sentences at the Special Criminal Court.
Mr McCartin said of Mr Lunney: "His ability to put this behind him and his focus on working for his community and business is remarkable."
He said the "flag is up" for whoever is responsible [for the crime] and that it will lead to nowhere but jail.
Mr McCartin confirmed that he and other directors of the company have, on occasion, been informed by the Gardaí and the PSNI that there are still credible death threats against them.
"You have to, at all times, be cognisant of the need to change patterns that might become recognisable," he said.
"You certainly do have to, at all times, be cognisant of the need to change patterns that might become recognisable"— RTÉ Prime Time (@RTE_PrimeTime) December 21, 2021
Following the sentencing of three men for the attack on Kevin Lunney, @MiriamOCal asks @mccartinjohn what impact threats still have on their lives | #rtept pic.twitter.com/yPfAHh4ukg
A 30-year sentence was yesterday imposed on a man known as YZ, who the media are unable to name for legal reasons.
A 25-year sentence and a 15-year term were imposed on two other men who also falsely imprisoned and caused harm to Mr Lunney at a yard in Ballinagh, Co Cavan in September 2019.
The sentencing judge, Mr Justice Tony Hunt, had commented yesterday as he imposed the sentences that the most severe penalties should be reserved for those who finance or benefit from these type of crimes.
"One would have to sit up and listen to what Mr Justice Hunt said when he passed down the sentences. His comments I imagine will not be lost on whoever procured and financed and expected to benefit from these acts of criminality," Mr McCartin said.
He told Prime Time the Garda Commissioner has already said he has the "bit between his teeth" in relation to the case, and the resources and resolve of investigators would cause anyone involved in the crime to worry.
Mr McCartin stressed that a "very, very small number of people" were involved in the "acts of criminality".