The Kray gang was a notorious criminal organization based in London during the 1950s and 1960s. Led by twin brothers Ronnie and Reggie Kray, the gang was involved in various illegal activities, including extortion, robbery, and violence. They gained a reputation for their ruthless tactics and were known for their connections to the underworld and London's East End. The Krays were not only criminals but also social figures, mingling with celebrities and politicians. Their criminal empire eventually led to their arrest in 1968, resulting in life sentences for murder. The story of the Kray gang has since become a significant part of British criminal history and popular culture.