Hatfield–McCoy feud
Between 1880 and 1891, the feud claimed more than a dozen members of the two families. On one occasion, the governors of West Virginia and Kentucky even threatened to have their militias invade each other's states. In response, Kentucky Governor S. B. Buckner sent his Adjutant General Sam Hill to Pike County to investigate the situation. More than a dozen people died and at least 10 people were wounded. A few days after the New Year's Massacre, a posse led by Pike county deputy sheriff Frank Philipps rode out to track down Devil Anse's group across the border into West Virginia. The posse's first victim was Jim Vance, who was killed in the woods after he refused to be arrested. Philipps then made other successive raids on Hatfield homes and supporters and captured three before cornering the rest in Grapevine Creek on 19 January. Unfortunately for Philipps, Devil Anse and other Hatfields were waiting for them with an armed group of their own. A battle ensued between the two parties, and the Hatfields were eventually apprehended. Two Hatfield supporters were killed, and a deputy, Bill Dempsey, was executed by Frank Philipps after they surrendered. Wall Hatfield and eight others were arrested and brought to Kentucky to stand trial for the murder of Alifair McCoy (sometimes spelled Allaphare, Randolph's young daughter), killed during the New Year's Massacre.
Billy Mitchell (loyalist)
Following the collapse of the 1973 ceasefire Mitchell became embroiled in a Loyalist feud that would ultimately see him imprisoned. The roots of the feud lay in the Ulster Workers' Council strike when a brawl between members of the UVF and the Ulster Defence Association at a bar in the Tiger's Bay area of north Belfast saw UVF member Joe Shaw killed by a shotgun in what both groups initially agreed was a "tragic accident". However tensions were stoked by the UDA claiming the Dublin and Monaghan bombings, which had actually been a UVF attack, and drunken fights between members of the rival organisations became common, culminating on 21 February 1975 when east Belfast UDA man Robert Thompson was stabbed and killed in one such brawl. The feud reached a zenith on 7 April when Hugh McVeigh and David Douglas, the UDA members identified by an internal UVF inquiry as responsible for Shaw's death, were abducted and taken to the British Legion Club in Carrickfergus where they were severely beaten. From there they were taken to a clifftop spot at Islandmagee where they were forced to dig two graves before being shot dead and their bodies buried in them. It was five months before the bodies were discovered.