Razor gangs were criminal organizations that emerged in Australia during the 1920s and 1930s. They were primarily involved in illegal activities such as gambling, drug trafficking, and extortion. The gangs often fought for control over territory, leading to violent confrontations and public disturbances. The term "razor" refers to the weapons commonly used by gang members, which were often straight razors. Notable razor gangs included the Carlton Crew and the North Melbourne Gang. Their influence declined after law enforcement increased efforts to combat organized crime, leading to significant arrests and the eventual dismantling of many gangs.