The Karrans are a primitive Human race in the Pegasus galaxy, from the planet Karra. They are allied with the Wraith, but despite this, the Tau'ri of the Atlantis expedition insist they watch over them. (SGA: "Wraithfall 3")
The Karrans perform a ritual known as Wraithfall. This is a deal with the Wraith, where they offer five of their people to them every three months. Those selected are then considered an Honored One, and are given a Holy medallion of Karra. When they are then taken into a Wraith Dart. It is considered a happy occasion.
Despite the Karrans being content with their arrangement, Major John Sheppard, Aiden Ford, and the Atlantis expedition intervened with the Wraith, driving them from their base of operations in an Experimental laboratory on Vohl. An act which was criticized by both the Wraith and the Karran Honored One Dakh. (SGA: "Wraithfall 3")