Glynn was a key figure in the murder cell formed when Daniel Kinahan joined forces with Thomas 'Bomber' Kavanagh's hit-team to wipe out the mob bosses' rival James 'Mago' Gately.
Under enormous pressure from gardaí and to reduce the risks of leaks, only the most trusted lieutenants of both mob bosses conspired to kill Gately when Estonian hitman Imre Arakas was brought to Ireland in 2017.
And when the plan spectacularly backfired both bosses lost their most senior generals, with Daniel Kinahan losing the last Dublin-based gang figure he could trust.
The impact of the operation by the Garda's Drug and Organised Crime Bureau - which foiled the murder of Gately in Newry, Co. Down - cannot be underestimated and was a seminal moment in the State's fight against the powerful Kinahan mafia, which had seen the merging of Kavanagh and Kinahan mobs into one force against the Hutch gang.
Glynn, Peader Keating and exiled Sean McGovern were all understood to have pooled resources to take hands-on roles in the assassination such was the level of paranoia of informers and leaks to gardaí at that point of the feud.
The mob's leaders in Ireland were sure they could trust one another to plan and carry out the hit with precision as Kinahan raged in the Middle East for a trophy kill to cement his reputation and power back home.
But the gang had no idea that Arakas was tailed from the airport by an undercover officer and followed first to the city centre where he was picked up by grandad Stephen Fowler and driven to his home at Blakestown Cottages to sleep before his mission to kill.
The timing and skill of the officers who watched and waited for the right moment to burst in and arrest Arakas is without doubt a blueprint in policing.
Not only was Arakas a huge prize, but photographs were taken off the screen of his encrypted phone before it deleted which showed messages between four user names 'Ow New', 'Knife', 'Bon4' and 'Bon new'.
The Sunday World understands that 'Knife' was a name used by Sean McGovern while the 'Bon' handles belonged to Daniel Kinahan. The cases have being making their way through the Special Criminal Courts ever since and this week Glynn admitted placing a tracker device on Gately's car in Belfast as part of the foiled murder plot.
A previously un-named member of the Kinahan mob, the Sunday World can today reveal that Glynn held the most senior role in Dublin in Kinahan mafia during the period and directed operations on the ground.
He was targeted in a follow-up operation using intelligence gathered during the Arakas bust and officers moved in on him during an operation which resulted in the discovery of a lock up containing machine guns and ammunition.
The area around the Hardwicke Street flats area was once the Kinahan mob powerbase and unofficial HQ here. Glynn is understood to have been particularly close to Daniel Kinahan and ranked higher than anyone else left behind in Dublin after the likes of McGovern and Ross Browning had fled the country.
Hardwicke Street was home to senior Cartel lieutenants including Gary Finnegan, currently the most senior mob man in Spain, CAB target Browning and convicted sex offender Barry Finnegan.
It was the zone identified as the Kinahan centre of power after the feud broke out in Feburary 2016.
Amongst the many mob members under Glynn's control was Martin Aylmer, currently before the Special Criminal Court, as the sixth man to face charges relating to the attempted Gately hit.
Glynn is believed to have controlled the weapons, the encrypted phone supply and the logistics around who did what as the mob desperately tried to get close to their man targets like Gately and Patsy Hutch.
It is understood that at one point up to 50 youngsters in the area had been put on retainers to watch Hutch targets and to furnish Kinahan mafia seniors with information about the movements of their one time neighbours.
Former British soldier Robert Browne, who pleaded guilty to his role in an attempted hit on Patsy Hutch, is originally from Hardwicke Street flats. It is understood he was hired by the Kinahans through contacts from the area.
Another senior Kinahan Cartel lieutenant Glen Holland also grew up there. He is serving a six-and-a-half year jail term after spending years on the run from gardaí.
Aylmer has a conviction in relation to the murder of Michael Barr, which was carried out by a hit team headed up by Eamon Cumberton and Liverpudlian David Hunter.
Glynn was re-arraigned at the Special Criminal Court this week and pleaded guilty to participating in activities of a criminal organisation. His plea means there will be no trial and sentence hearing in the case will happen on January 14. There was no objection to Glynn continuing on bail.
He is the fifth man to be found guilty in cases relating to the failed bid to murder Gately in Belfast.
In September, Peter Keating (40) of Rowlagh Green, Clondalkin, Dublin 22 was jailed for 11 years after he pleaded guilty in June to directing the activities of a criminal organisation between December 7, 2016, and April 6, 2017, within and outside the State relating to the targeting of Gately.
Stephen Fowler (62), of Blakestown Cottages in Clonsilla, Dublin 15 and David Duffy (33), of Greenfort Lawns, Clondalkin, Dublin 22 have already been jailed for providing logistical support to the plot to murder Gately.
Estonian hitman Imre Arakas (63) was jailed by the Special Criminal Court for six years in December 2018, after he admitted to conspiring with others to murder Gately in Northern Ireland between April 3 and 4, 2017.
In another attempt on his life, Gately survived being shot five times as he sat in his car at apetrol station on the Clonshaugh Road in north Dublin on May 10, 2017.
In February Caolan Smyth (30), of Cuileann Court, Donore, Co. Meath, was sentenced to 20 years for the attempted murder of Gately.
Gary McAreavey (53), of Castlebellingham, Co Louth, had pleaded not guilty to acting to impede an apprehension or prosecution.He received a four-year jail term with the final year suspended.
'one shot to the head from a distance...'