Matilda Mary Devine, known as Tilly Devine, was an English Australian organised crime boss. She was involved in a wide range of activities, including sly-grog, razor gangs, and prostitution, and became a famous folk figure in Sydney during the interwar years.

Razor gangs were criminal gangs who dominated the Sydney crime scene in the 1920s. After the passage of the Pistol Licensing Act 1927, the Parliament of New South Wales imposed severe penalties for carrying concealed firearms and handguns. In response, Sydney gangland figures began to use razors as their preferred weapons.