Blood feud

A blood feud was a conflict between social groups, often families, that resulted in a cycle of retaliatory violence.
Until the 2260s, Acamarian society was plagued by blood feuds between rival clans, in which the slightest injury to a clan member demanded violent retribution. These feuds could last decades or even centuries, passing from generation to generation, and plunged Acamar III into chaos. ()
Blood feuds were common between the Great Houses of the Klingon Empire. Whenever a Klingon was killed or dishonored, the other members of their House were obligated to seek vengeance. Jadzia Dax jokingly remarked in 2374 that this state of affairs was "boring". ()
Mogh saved the honor of Huraga's family during their blood feud with the House of Duras. ()
There was no blood feud between the House of Martok and House of Kor as of 2375. ()
Captain Jean-Luc Picard characterized the 2375 conflict between the Son'a and the Ba'ku as a blood feud, after discovering that they were members of the same race. ()
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