Krampus is the Santa's other half. When children were really bad, they not only got a lump of coal in their stocking, but Krampus came to get them.
Krampus would either spank them with branches or lock them up in a cave. He's a part of the Santa folklore, but he's not talked about a lot. Mostly because he's too scary for youngsters, but I love the story and this particular pic.