The Maw of Fenris

The Maw of Fenris was a cult that wanted to achieve werewolf dominance on earth.

Background
They worshipped the wolf, Fenris as a god and followed the teachings from The Book of Fenris. They wore silver bullets around their neck, engraved with the word "Ragnarok". The cult was active few generations ago, cultivating werewolves' hatred of mankind. But when reverend Jim Myers took over, he preached co-existence and managed to eradicate the cult.

Season 9
Unknown to the reverend, his wife Joy restarted the cult after her brother was killed by a hunter. She believed, along with her father that as along as man lived, he would only destroy. She wanted to rule them and for that planned to convert the reverend to her cause. She kidnapped Garth and Bess and was going to kill them and pin their murders on the brothers. This would finally turn the werewolf community against the humans. But she was killed by Dean who put a stop to their plans.