Gardai have prevented five gangland assassinations since February and have vowed to track down those responsible for the recent feud-related killings.
Assistant Garda Commissioner Michael O'Sullivan, who is currently in charge of the Drugs and Organised Crime Bureau, said there was no criminal gang that stood the test of time.
"Eventually their members, both at high and low levels, are arrested and their empire falls apart," he said.
"Criminal history over the past 20 years shows that gangs come and gangs go. They fall apart and their members are arrested."
There were several cases where people's lives had been saved through proactive policing operations and, in some of those, the details had not made the newspapers because of the nature of the garda operation, said Mr O'Sullivan.
The assassinations were thwarted by overt and covert operations by garda units with the aid of criminal intelligence.
Meanwhile, Justice Minister Frances Fitzgerald has announced that an additional allocation of €55m was being made available for the rest of the year, including the €5m allocated in February to fund garda operations.