<P> In Harry Potter and the Deathly Hallows, Greyback leads a Snatcher gang--Dark wizards looking for Muggle - borns and "Undesirables" in exchange for gold . When Harry accidentally uses Voldemort's name after it has been made taboo, Greyback is alerted and his gang attacks their camp . Harry, Ron, and Hermione are kidnapped by the Snatchers and are taken to Malfoy Manor . Bellatrix Lestrange promises Hermione to Greyback in return for his services, but the prisoners fight their way out and escape, Greyback being hit by a triple Stunning Spell . Greyback is the main werewolf within the pack that agrees to aid Voldemort in the Battle of Hogwarts . During the battle, Hermione, using a blasting curse, prevents Greyback from attacking injured Lavender Brown, and a crystal ball thrown by Professor Trelawney stuns him . He rejoins the battle in time for the Death Eaters' last stand, when Ron Weasley and Neville Longbottom combine forces to take him down by magic . </P> <P> Dave Legeno portrayed Greyback in the film adaptation of Harry Potter and the Half - Blood Prince . He reprised the role in both parts of Harry Potter and the Deathly Hallows . </P> <P> Igor Karkaroff (Cyrillic: Игорь Каркаров) is the Headmaster at Durmstrang Institute, one of the three schools (together with Hogwarts and Beauxbatons Academy) that enter the Triwizard Tournament . As Headmaster, Karkaroff is also one of the judges . He is described as a neat, fussy - looking man with an oily voice and manner who sports a small grey goatee . While unctuously pleasant most of the time, he is capable of violent rage . He is also described as "a man with yellowish teeth whose smile does not reach his cold stare". Karkaroff is angered and threatens to withdraw from the tournament when Harry is selected as a fourth champion and second representative for Hogwarts . Although he is talked down and agrees to stay, he nevertheless shows evident favouritism towards the Durmstrang champion, Bulgarian Quidditch player Viktor Krum . Sirius Black later identifies Karkaroff as a former Death Eater . Karkaroff was captured by Auror Alastor Moody and imprisoned in Azkaban . Karkaroff later told the Ministry of Magic that he had seen the error of his ways, and "named names", putting many people in Azkaban in exchange for his freedom . Karkaroff is thus also hated by the Death Eaters . Karkaroff's history gives him a connection with Snape, also a former Death Eater . "Karkaroff interrupts a Potions lesson demanding to talk to Snape, and shows him his Dark Mark reappearing . Igor also apparently has an unpleasant history with Alastor Moody, and tries to avoid him unsuccessfully for the entirety of the tournament, not knowing that it is Barty Crouch Jr. in disguise . At the end of the novel, following Voldemort's return, Karkaroff goes into hiding, leaving behind his student charges at Durmstrang . In the sixth novel, Harry Potter and the Half - Blood Prince, Remus Lupin states that Karkaroff was found dead in a shack with the Dark Mark hovering over it, an indication that he was killed by other Death Eaters . Lupin also expresses surprise that Karkaroff managed to live even a year after deserting Voldemort and that no one else has been known to avoid capture quite as long . </P> <P> Predrag Bjelac appeared as Karkaroff in the film adaptation of Goblet of Fire . </P>

When did peter pettigrew become a death eater