Hunters arise to protect humans from supernatural threats. Some hunt solo while others hunt in groups.
Nemrods are an exception, as they hunt vampires out of a hatred for vampires, not necessarily to protect mortals.
The oldest group of vampire hunters known currently is the Brotherhood of Saint's Paul Stole. This group is still active, but only hunts the vilest of vampires.
Events of VAMPYR
Various Hunters can be found within London during the Vampire epidemic. The most numerous is the Guard of Priwen, who patrol the streets of London at night to eliminate the vampire threat. Edgar Swansea when first encountered is also hunting a vampire, though he is working with another vampire to do so. Finally the fledgling vampire hunter Ichabod Throgmorton can be found in the docks.
One group not seen in Vampyr, but mentioned in "The Crime of Lost Knowledge" is the Vatican's vampire hunters.