Kinahan lieutenant Liam Byrne has been a target for the UK's top crime agency for up to six years.
Senior sources have told the Irish Mirror that the National Crime Agency's interest in the gangster was sparked by a garda raid which also brought down two other senior members of the mob.
Documentation seized by the gardai in a raid of the Greenogue industrial unit in west Dublin in 2017 was the beginning of the end for 42-year-old Byrne.
