I think on how are respected the Calabrians by the colombians (and the other latinos drug cartels): the others that made bussiness with the colombians must left an hostess that will be killed if the money dont come back instead for the calabrians is enough their word that will pay the drug and dont need any host age. And in a incasso book are cited many case which mafiosi must ask help to their cousins because dont had the money and their men will be killed.