The fatal shooting of David Byrne in the Regency Hotel in 2016 escalated a murderous gangland feud in Dublin and marked a defining moment for those within An Garda Síochána tasked with fighting organised crime. They knew it would no longer be enough to tackle each incident of criminality as it occurred; they had to totally dismantle the group said to be behind the Regency attack and other gangland executions. That group was the Kinahan cartel, operators of a transnational empire valued by police at €1 billion. Rooted in Dublin’s south inner city since the 1990s, the gang is said…