The Sydney Underworld refers to the network of organized crime and illegal activities that have historically taken place in Sydney, Australia. This underworld is characterized by various criminal enterprises, including drug trafficking, extortion, and money laundering. Key players often include gangs and syndicates that operate both locally and internationally. Throughout the years, the Sydney Underworld has been marked by high-profile incidents, including gang wars and police operations aimed at dismantling criminal organizations. Notable figures, such as Carl Williams and Mark "Chopper" Read, have gained notoriety for their involvement in these activities, contributing to the public's fascination with crime in the city.