As indicated by Theraldis' comments in [75] Out of Body Experience, Arugal was sent to Solstice Village to convert the population into worgen, and later did the same in Silverbrook. He then settled his base of operations in Shadowfang Tower on Bloodmoon Isle, off the Eastwind Shore. The majority of the populations of the trapper villages willingly joined the Wolfcult, while those who resisted were killed or (in the case of the workers of the Hollowstone Mine) cursed to undeath.
Until the Alliance sent emissaries to ally with the locals in Silverbrook, the Wolfcult operated in secrecy; however, the Alliance eventually discovered the truth behind the trappers. (By contrast, Conqueror Krenna, leader of the Horde's Conquest Hold, seems to dismiss any talk about worgen as "nonsense", as indicated in the completion text for [75] My Enemy's Friend.) Players are then sent on a series of quests involving the seer Ruuna the Blind and the trapper Sasha, whose father Mikhail was killed by the Wolfcult, culminating in a final battle with the shade of Arugal at Shadowfang Tower.
These humans have the ability to transform into a worgen at will and are not forced to change at night. When they are killed they transform back into humans, ending their curse. However, there are some that have changed into a full fledged worgen, these do not change and will remain as a skinnable worgen after death.