BBC's documentary "Legend" chronicles the notorious Kray twins, who became symbols of London's criminal underworld during the Swinging Sixties. The film explores how Reggie and Ronnie Kray transformed from small-time gangsters into feared figures who controlled much of the East End's criminal operations, wielding power through violence and intimidation.

The two-hour production examines their violent rise to power, their connections to the London nightlife scene, and the notorious crimes that led to their eventual imprisonment. The program contains very strong language, sexual violence, and disturbing scenes, reflecting the brutal reality of their criminal enterprise. First shown in 2015, the documentary uses this backdrop to paint a vivid picture of an era defined by both cultural revolution and street-level terror.

The Krays' story remains compelling because it captures a transformative period in London history when organized crime intersected with the city's rapidly changing social landscape. Their reign ended with consecutive life sentences in 1969, but their legend continues to fascinate audiences decades later, cementing their place as the most iconic gangsters in British criminal history.