The Koshka Brotherhood (Bratva, "Koshka" means "female cat") is a criminal organization in DEXTER that appears in Season Seven as the Main antagonists. Isaak Sirko appears to be the "Don" of the mob and has extended the reach of their influence as far as the United States, prominently within Miami. With the deaths of their leader Isaak, the head of operations Viktor Baskov, the manager of the foxhole club George and the other members, the Mafia is likely to be severely weakened and crushed.