What clan does Scourge belong to?

Scourge first lived in the Twolegplace (Twoleg neghborhood) but then he got his friends/servants to raid into the forest along with Tigerstar's help and called themselves BloodClan. Then, Scourge back-stabbed Tigerstar and ripped him apart along his underbelly, and then Firestar attacked, Scourge died, all the BloodClan warriors retreated to the Twolegplace.