Question: Who was the writer of the film in which the twin gangster  performed who were the foremost perpetrators of organised crime in the East End of London during the 1950s and 1960s?
Sentence (from "Kray twins"): With their gang, the Firm, the Krays were involved in armed robberies, arson, protection rackets, assaults and the murders of Jack "the Hat" McVitie and George Cornell.
Relevant evidence: No