The photograph was taken inside Mountjoy Prison and features a number of notorious gangsters, including gun criminal Paul Beatty.
Beatty was arrested by gardai earlier this year in connection with the murder of Jason 'Buda' Molyneux as part of the Hutch-Kinahan feud.
He is currently serving a seven-and-a-half-year sentence for possession of a firearm gardai believe was going to be used in a feud attack.
Beatty was later released without charge over the Molyneux murder.
He can be seen pictured holding a so-called 'beat the Boss' phone. The tiny phones are designed to evade detection by the Body Orifice Security Scanner (Boss) used by prisons to detect contraband hidden inside someone's body.
They are popular among inmates in Irish prisons and a number have been seized from Kinahan associates in Mountjoy in recent weeks.
While Beatty, from East Wall in Dublin, isn't facing any charges in relation to the Molyneux murder, he is suspected of being a trusted footsolider for the cartel.
Criminals on the Kinahan side of the feud are believed to have targeted Molyneux as they feared he would seek revenge for the murder of his pal Derek Coakley Hutch, who was shot dead outside Cloverhill Prison in Dublin in January 2018.
Ironically, a close associate of Coakley Hutch is pictured beside Beatty in the picture taken behind bars.
The man was attacked by the Hutch side last year because of his association with Kinahan-linked criminals behind bars and is seen as a turncoat by them.
Last week the
Sunday World published a video showing the same man partying with fellow inmates in Mountjoy.
That man is not the only one in the picture who turned his back on his former associates to side with the Kinahans.
Another person pictured is Andrew O'Keefe, who is serving an eight-year sentence for possession of a handgun and silencer in September 2017.
Gardai believe O'Keefe, from Drumcliffe Road, Cabra West, Dublin, was on his way to kill mobster Kane Kirwan McCormack when he was arrested.
O'Keefe had been close to McCormack and his then girlfriend and was believed to have been recruited by the cartel to carry out the hit because he knew his target and his movements.
The plot was foiled when gardai received information that there was a firearm in a white Citroen Berlingo van in Ballyfermot, Dublin, on September 6, 2017.
O'Keefe was arrested by members of the Drugs and Organised Crime Bureau (DOCB) when he tried to flee. There was one round in the breech of the gun and a further eight rounds in the magazine.
O'Keeffe has 71 previous convictions, which include assault causing harm, violent disorder, public order and theft.
Another man in the picture is Ciaran O'Driscoll, who is serving a five-year sentence for his part in a failed plot to kill Patrick 'Patsy' Hutch.
O'Driscoll, of Avondale House, North Cumberland Street, Dublin 1, admitted to acting as a lookout in the 2018 plot.
His job was to alert the gang when Patsy left his house, so he could be shot.
Beatty was caught in possession of a loaded firearm after gardai had him under surveillance in Dublin on June 2, 2018.
Gardai suspect the weapon was going to be used in a gun attack on a member of the Hutch gang.
Beatty was previously jailed after being arrested with a firearm, latex gloves and petrol cans in Clonshaugh, Dublin, in 2009, which gardai were believed were going to be used in a hit attempt on an associate of Anthony Russell who was shot dead in Artane in north Dublin the previous year as part of the Sheriff Street feud.
Sunday World has published a series of videos and pictures of Kinahan mobsters in Mountjoy in recent weeks.
Earlier this month the Sunday World obtained phone footage from inside the prison showing one of the Kinahan cartel's most feared gunmen laughing and joking about shootings.
An album of mob pictures taken inside the prison also shows how the same gunman, Trevor Byrne - who was chief suspect for the 2014 shooting of John Gilligan and who was quizzed over the murder of Eddie 'Ned' Hutch (58) - is living the high life with his fellow Kinahan cartel inmates behind bars.
We also revealed last week how the amount of drugs and phones seized inside prisons has risen to record levels.
There have been a number of recent major seizures linked to the Kinahan-linked prisoners in Mountjoy in recent times including two seizures worth €170,000 and €150,000.
There were 1,191 drug seizures made in the first ten months of 2021, more than in the whole of 2020 and nearly double the figures from five years ago.
The 1,338 phones seized marks an increase from last year's total of 1,251 and is again almost double the number seized in 2016.