“Karkaroff,” said Sirius. “Harry, he was a Death Eater. You know what Death Eaters are, don’t you?” “Yes — he — what?” “He was caught, he was in Azkaban with me, but he got released. I’d bet everything that’s why Dumbledore wanted an Auror at Hogwarts this year — to keep an eye on him. Moody caught Karkaroff. Put him into Azkaban in the first place.”
