John Frederick "Chow" Hayes was an Australian criminal who became known as Australia's first gangster.

Kathleen Mary Josephine Leigh was an Australian underworld figure who rose to prominence as a madam, illegal trader of alcohol and cocaine, and for running betting/gambling syndicates from her home in Surry Hills, Sydney, Australia during the first half of the twentieth century. Leigh, known as the ‘Queen of Surry Hills’, was a sly groger and fence for stolen property.