Businessman Steve Collins, whose son Roy was murdered by the notorious McCarthy-Dundon gang, was left sickened when he heard their name this week.
The gang has been linked to the killing of serial hitman Robbie Lawlor - and Mr Collins fears the incident may mark its return to serious crime.
In an exclusive interview, Mr Collins told the Irish Independent: "It brings it all back when we hear that name mentioned, we thought the name Dundon had been buried for good and that they were gone."
The worrying re-emergence of the Dundons as part of the Drogheda feud could not have come at a more poignant time for the Collins family.
Today marks the 11th anniversary of Roy's murder which took place in his amusement arcade in Limerick on Holy Thursday April 9, 2009.
As the PSNI continues to investigate Lawlor's murder in Belfast, gardaí believe the Dundons agreed to set him up for the Maguire/Price faction in Drogheda.
This faction in turn wanted revenge on Lawlor for leaving one of the gang leaders paralysed after an assassination attempt, and the shocking murder and dismemberment of 17-year-old Keane Mulready-Woods.
Mr Collins said he will be seeking a meeting with senior gardaí in Limerick to review the security situation for his family in light of the recent revelations.
He said: "When I read about the involvement of the Dundons in a high-profile murder, with Wayne [Dundon] openly celebrating in prison and some of his associates being arrested... and then gardaí lifting the money they had supposedly been paid, I was sickened.
"I was disappointed and shocked that the new generation seems to be on the way back and that they are trying to ingratiate themselves with other gangs; the State must make sure they are stopped in their tracks and are never again allowed to cause the chaos and misery they brought to Limerick.
"Wayne Dundon and his brothers are still organising murders from behind bars and then celebrating them just like they did with our Roy, Shane Geoghegan and many others.
"They are obviously as treacherous now as they ever were. It reminds us of the pond life that they are, that they are happy to take credit for double-crossing thugs like themselves."
Last year marked the 10th anniversary of Roy Collins's death. Less than two weeks afterwards his mother Carmel, who never recovered from the loss of her eldest child, passed away on Easter Sunday.
"It is very stressful that the Dundons are back in the news just as we mark the anniversaries of Roy and Carmel, who died from cancer which I believe was caused by the stress we endured over the years.
"We buried her beside Roy and just before she passed away I think she was happy that at least the people who caused all this heartache had gone off the stage and we could be left to live in peace," added Mr Collins.
Wayne Dundon (41) is serving a life sentence for the murder of the innocent businessman.
His younger brother Dessie (35) is also serving a life sentence after he was convicted of involvement in the murder of Kieran Keane in 2003.
The connections between the Louth gang and the remnants of the McCarthy/Dundons are thought to have been made through the Dundon brothers in prison.
Three males from Limerick, including a 17-year-old, accompanied Lawlor to Belfast on a mission to collect a drug debt last weekend before he was murdered. Then, on Monday, there was further evidence of the involvement of the McCarthy/Dundons when gardaí seized €50,000.
It is believed it was delivered by associates of the Maguire/Price gang to two women with close links to the Limerick mob who were arrested on suspicion of money laundering and later released.
And yesterday the Irish Independent revealed Wayne and Dessie Dundon were openly celebrating Lawlor's demise in Mountjoy Prison.
The development has come as a source of serious and understandable concern for the Collins family, who returned to live in Limerick after being forced to leave the country as part of a witness relocation programme eight years ago.
"Our kids have been rebuilding our lives and Steve junior now owns a very successful business in Limerick and that was of some comfort to Carmel before we lost her," said Mr Collins.
"Limerick is a safe, peaceful and prosperous city again and that was only achieved when we all worked together and told these scum that we would not tolerate them any longer.
"We got new laws introduced to take on the big gangs and I think those same laws have made a huge difference for the gardaí taking on the likes of the Kinahan and Hutch feud.
"That is why everyone in Limerick will be worried that the younger generations of the McCarthy-Dundons are coming of age and starting to create trouble on the orders of the likes of Wayne, John and Dessie Dundon.
"I would say to the Government and the gardaí that they cannot allow them to bring the fear factor back.
"The gardaí need to put the boot on their necks the same way they did before."
Mr Collins said the people of Drogheda "should be very worried" that the remnants of the McCarthy-Dundons have been making alliances with one of the feuding gangs.
And he said the likes of Wayne Dundon would admire the horrific dismemberment of Keane Mulready-Woods.
"There is a very serious situation in Drogheda but the people there should be very worried at the prospect of the Dundons adding to the mix because that is like pouring petrol on the fire.
"Wayne and John Dundon would actually admire what was done to that poor 17-year-old kid because they have mutilated people themselves in the past to create total fear.
"For them the dirtier and crueller the methods used then the better," he added.