The Melbourne gangland killings were the murders of 36 underworld figures in Melbourne, Victoria, Australia, between January 1998 and August 2010. The murders were retributive killings involving underworld groups. The deaths caused a power vacuum within Melbourne's criminal community, and rival factions fought for control and influence. Many of the murders remain unsolved, although detectives from the Purana Taskforce believe that Carl Williams was responsible for at least ten of them. The period culminated in the arrest of Williams, who pleaded guilty on 28 February 2007 to three of the murders.