This method is to gang up in a group, which in effect hangs up a notice saying: anyone who commits an act of aggression against any one of us must expect retaliation from us all, and not only will the aggressor himself be likely to suffer retaliation, but his entire group and all its members will be equally liable. And this notice is in effect posted by the very culture which pervades pastoral societies. It constitutes the code of honour which is familiar to all. So the gangs themselves do not need literally to put an announcement in the press or even on their tent. The culture, or specifically the obligation of feud which is inherent in it, does it for them.

Diego Gambetta, Trust - Making and Breaking…, loc. 1926