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The Northsea Freebooters are a group of pirates that arrived in Howling Fjord and set up a port at Scalawag Point. Under the leadership of Jonah Sterling, they began looting from graves and fighting both the Alliance and the Horde whilst at the same time waging a war against the tuskarr to sell as slaves to other lands (whom die just days after leaving their climate). 
They have a severe dislike of the Southsea Freebooters, from which they mostly likely branched off from.
Because of their lack of hygiene, most of their ships carry five or six times as many rats as pirates, so when they arrived at Scalawag Point, it was no surprise that the nearby bears became rabid soon after.