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William Joseph Hollebone (1 January 1917 – 28 September 1960), known informally as 'Joey' Hollebone, was a notorious and violent member of the criminal underworld, based in the inter-city suburbs of Sydney, New South Wales. Hollebone began serving a decade-long sentence for manslaughter in 1935, during which he met 'Chow' Hayes. From the mid-1940s to the mid-1950s Hollebone and Hayes were the best-known and feared of Sydney's criminal gunmen, with newspapers regularly reporting on their nefarious activities.