But now, said Carole Theriault, security consultant at Sophos, the feud appears to be cooling off.
In 2008, they agreed on principle to resolve the feud by jointly developing gas fields.
Tension raised by the feud has forced 36 families to leave their homes on the Shankill Road.
Mr Mandelson said he had evidence of the leading loyalist's involvement in heightening tensions in the feud.
Yet the battle over Gucci was not the end of the feud between the two French barons.
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Sam Rocket, 22, the latest victim of the feud is understood to have had links to the UVF.
Tensions are high on the Shankill Road Belfast where the feud between the rival loyalist organisations is centred.
The feud is, according to aides, partly driven by small but significant ideological differences, partly fueled by personality.
The court heard there were three stabbings over the feud in a week.
The feud within the UDA earlier in the year led to some leaving the country while others were jailed.
He defended the PSNI's response to the feud, and described the searches and arrests as a "proactive policing response".
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The feud did not, as Mr Shesol claims, define the decade, but his study illuminates some of the key events.
If they are overcome, India and Pakistan might finally end the feud that began when they became independent in 1947.
They started applying to be rehoused after the feud flared up at a UDA-linked festival on the road at the weekend.
Violence linked to the feud also spread out of Belfast to other areas of Northern Ireland, including counties Antrim and Londonderry.
The feud apparently blew up because the creators of the Bagle virus were jealous of the media attention that Netsky was getting.
Fueling the feud is the fact that the Justice Department and SFO are both under mounting pressure to prove their financial-crime-fighting mettle.
Benioff denies he is part of the feud between Ellison and Siebel.
Industry observers say the feud between Intel and Negopronte has been childish.
But the feud now appears to have acquired its own deadly dynamic: each offence by one group has prompted revenge by another.
In Coleraine, an 11-year-old girl, Charlene Daly, was injured when her home was sprayed with gunfire in an attack linked to the feud.
The feud apparently turned off some sponsors for the event including Nestle, and prompted critics to complain about the excessive spending by the competitors.
When Icahn went on Bloomberg TV Thursday and criticized his old foe for his very public shorting of Herbalife, it reignited the feud.
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She said that if the feud goes on Netsky and Bagle could become one of the few viruses to rack up more than 26 variants.
Several other Peronist hopefuls (including Adolfo Rodriguez Saa, president for a week last December, and another frontrunner) also appear reluctant to step in to the feud.
The feud had been heading for a showdown at Mr Sondhi's most recent rally, on December 9th, for which he had vowed to assemble half a million protesters.
Perhaps the best-known example of the problems of family ownership is the feud between the Ambani brothers, who after their father's death divided the family's huge conglomerate, Reliance, between them.
When Northern Ireland Secretary Peter Mandelson ordered Adair's re-arrest, he said the peace process could have been derailed if the feud between rival loyalist paramilitary groups had spread to Catholic areas.
As the feud violence spread from Belfast to other parts of Northern Ireland, there were a number of attacks on houses in Carrickfergus, Larne and Ballymena, County Antrim and in Londonderry.
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