I agree with you that they are similar in ideology, methods, practices, more than likely part of one system.

In attempting to kill a member of LE or arrest a fugitive, the island of Sicily, limits the escape routes. Which in theory should make either easier, arresting fugitives in Sicily has been hard, killing LE seemed easy for the Corleonesi. However, I doubt that it was accomplished without involvement for members spread out through Italy and World.

If the Ndragheta is successful, it’s gonna involve the same mechanics, and type of people.