A sentence of life imprisonment for Kevin Braney has dealt a major blow to the most dangerous terrorist group operating on this island.
The New IRA poses the biggest threat to the security of the State since the Provisional IRA ceasefire in 1994, according to Garda security and intelligence.
And it is also top of the terror list in Northern Ireland where last month it was responsible for the car bomb attack outside a courthouse in Derry.
Braney (44), from Glenshane Crescent in Tallaght, Co Dublin, is regarded by gardaí as the group's most important figure on this side of the Border.
He has been high on the monitoring list for the Special Branch for well over a decade and was previously the leader of the Real IRA in the capital.
In 2012, the New IRA was formed following an alliance of former factions of the Real IRA, Republican Action Against Drugs and veteran republicans, who had remained unaligned initially after the Provisionals adopted the peace process.
Braney pledged his allegiance to the new group when it was formed. He quickly established himself as a leader, taking charge of its members in Dublin and Cork.
His influence grew as the New IRA built up strongholds in other counties such as Louth. He also became the Dublin chairman of a political organisation known as Saoradh, which has the support of New IRA prisoners in jails on both sides of the Border. He had been involved with Saoradh since its foundation in 2016.
Its first ard fheis, held in Newry, was attended by prominent dissident republican Colin Duffy, from Lurgan, and it was told Saoradh had the support of prisoners in Portlaoise and Maghaberry. Braney was one of four men arrested by the Special Branch and gardaí from Meath in August 2017 after inquiries into cross-Border activities by the New IRA and an investigation into an incident involving intimidation and threats in Longwood, Co Meath, the previous month.
This resulted in Braney being charged, convicted and jailed for membership of an unlawful organisation. The New IRA has more than 50 activists listed as persons of interest to the Garda security and intelligence section and is estimated to have 200 supporters.
Its members on this side of the Border are largely involved in providing logistical support for their active units involved in terrorist attacks in the North, including supplying explosives and arms, as well as vehicles and safe houses and raising funds through robberies and extortion.
It is also assessed to be more advanced technologically in developing explosive devices than any of the other renegade IRA groups.
The interception of four mortars in a van by the PSNI in Derry in 2013 alerted the security forces to the additional skills that were being deployed by the dissidents.
The New IRA plans to exploit the possibility of a hard Brexit by stepping up its campaign of terrorism in Northern Ireland but there is no doubt that Braney's conviction is a decisive setback to the gang in the Republic.