The term "London underworld" refers to the hidden and often illegal activities that take place in the city, typically involving organized crime. This includes activities such as drug trafficking, extortion, and illegal gambling, often orchestrated by criminal groups or gangs. The underworld has a long history in London, with various notorious figures and organizations emerging over the years. Key areas associated with the London underworld include East End neighborhoods, where many criminal enterprises have operated. Law enforcement agencies, such as the Metropolitan Police, work to combat these activities, but the underworld remains a persistent challenge due to its secretive nature and the complex networks involved.