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 "The Krays (film)"): The Krays is a 1990 British drama film based on the lives and crimes of the English gangster twins Ronald and Reginald Kray, often referred to as the Krays.
Relevant evidence: Yes