The Special Criminal Court has jailed three men who abducted and tortured the businessman Kevin Lunney in September 2019.
Alan O'Brien (40) of East Wall in Dublin, was jailed for 25 years.
Darren Redmond (27) also from East Wall in Dublin, was sentenced to 18 years with the last three suspended.
A third man, who is 40, inflicted the most serious injuries on Mr Lunney.
Mr Justice Tony Hunt called him the ringleader and sentenced him to 30 years.
He cannot be named for legal reasons.
On 17 September 2019, when he arrived home from work in Co Fermanagh, Kevin Lunney was thrown into the boot of a car, beaten, taken to a horse box in Co Cavan and tortured.
The three men broke his leg, poured bleach over him and carved the initials QIH into his chest.
They told him that he and the other directors of Quinn Industrial Holdings (QIH) were to resign.
The attack was coordinated by convicted criminal Cyril McGuinness known as "Dublin Jimmy".
He went on the run but died of a heart attack in November 2019 on the day that the UK police raided his house and found him.