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?

Context paragraphs:
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.  The film was written by Philip Ridley and directed by Peter Medak.

Organised Crime Task Force (Northern Ireland): The Organised Crime Task Force is a multi-agency law enforcement agency operating in Northern Ireland.  It was established in September 2000 following a report by New York Professor Ronald Goldstock, into the threat from Organised Crime and its role is to set the strategic direction for a multi-agency approach to tackle organised crime in Northern Ireland.  Partner agencies include the Police Service of Northern Ireland (PSNI), HM Revenue and Customs, Serious Organised Crime Agency, the Northern Ireland Executive, the Northern Ireland Policing Board, and the Home Office.  The Confederation of British Industry, Northern Ireland Chamber of Commerce, Federation of Small Businesses and Criminal Justice System Northern Ireland are also members.

Billy Hill (gangster): William "Billy" Charles Hill (13 December 1911 – 1 January 1984) was an English criminal, linked to smuggling, protection rackets, and extreme violence.  He was one of the foremost perpetrators of organised crime in London from the 1920s through to the 1960s.  He project managed cash robberies and, in a clever scam, defrauded London's High Society of millions at the card tables of John Aspinall's Clermont Club.

'Ndrangheta: The 'Ndràngheta (] ) is an organized crime group centered in Calabria, Italy.  Despite not being as famous abroad as the Sicilian Mafia, and having been considered more rural than the Neapolitan Camorra and the Apulian Sacra Corona Unita, the 'Ndrangheta became the most powerful crime syndicate in Italy in the late 1990s and early 2000s.  While commonly tied together with the Sicilian Mafia, the 'Ndrangheta operates independently from them, though there is contact between the two, due to the geographical proximity and shared culture and language between Calabria and Sicily.  A US diplomat estimated that the organization's narcotics trafficking, extortion and money laundering activities accounted for at least 3% of Italy's GDP in 2010.  Since the 1950s, the organization has spread towards Northern Italy and worldwide.  According to a 2013 "Threat Assessment on Italian Organised Crime" of Europol, the 'Ndrangheta is among the richest and most powerful organised crime groups at a global level.

East End, Saint Thomas, U.S. Virgin Islands: East End is an administrative subdistrict of the island of Saint Thomas in the United States Virgin Islands.  The largest community here is Red Hook, while smaller communities include Benner, Nazareth, Nadir, Frydendal, and Smith Bay.  Some of the offshore islands here include Great Saint James Island, Little Saint James Island, Bovoni Cay, Patricia Cay, Cas Cay, Rotto Cay, Thatch Cay, Shark Island, and Dog Island.  The East End subdistrict received 731 new residents between the 2000 U.S. Census and the 2010 U.S. Census, and has a 2010 population of 6,658.  The East End region offers a more secluded character and less population density than subdistricts as Charlotte Amalie, Southside, and the Tutu subdistricts.  This subdistrict is home to numerous of the islands’ largest resorts, in addition to many shopping areas and entertainment venues, as well as the Coral World Marine Park & Underwater Observatory in Coki Point, which is the most popular tourist attraction on Saint Thomas.  East End is located about 7.4 miles east of the territorial capital of Charlotte Amalie, which is an approximately thirty-minute drive on the windy, small and narrow Saint Thomas roads.  There are buses and taxis leaving from the East End.  A typical fare for a taxi drive to the capital costs $20.  The hotels on Saint Thomas are evenly divided between the two subdistricts of Charlotte Amalie, and the more expensive resort-style hotels by their own beachside in East End.  The East End resorts are therefore generally more expensive than those found elsewhere on the island.  Some of the famous beaches found here are Lindquist- and Sapphire Beaches, while others include Pineapple Beach (Renaissance Beach) and Vessup Beach amongst others.

Drugs and Organised Crime Bureau: The Garda National Drugs and Organised Crime Bureau (DOCB) is a specialist national unit within the Garda Síochána, Ireland's national police service, responsible for proactively targeting and investigating drug trafficking and serious organised crime both within Ireland and outside the jurisdiction.  The Drugs and Organised Crime Bureau has a complement of 111 Detective Gardaí and a total staff of up to 400 officers, all of whom are armed.  The bureau is based at Dublin Castle, Dublin 2 and also has offices at the Garda Dublin Metropolitan Region (DMR) Headquarters at Harcourt Street, Dublin City.  It is headed by a Detective Chief Superintendent and four Detective Superintendents, reporting to the Assistant Commissioner in charge of the "Garda National Support Services".

Gangs in the United Kingdom: Gang-related organised crime in the United Kingdom is concentrated around the cities of London, Manchester and Liverpool and regionally across the West Midlands region, south coast and northern England, according to the Serious Organised Crime Agency.  With regards to street gangs the cities identified as having the most serious gang problems, which also accounted for 65% of firearm homicides in England and Wales, were London, Birmingham, Manchester and Liverpool.  Glasgow in Scotland also has a historical gang culture with the city having 6 times as many teenage gangs as London, which has ten times the population, per capita.

Kray twins: Twin brothers Ronald "Ronnie" Kray (24 October 193317 March 1995) and Reginald "Reggie" Kray (24 October 19331 October 2000) were English gangsters who were the foremost perpetrators of organised crime in the East End of London during the 1950s and 1960s.  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.

Maharashtra Control of Organised Crime Act: Maharashtra Control of Organised Crime Act, 1999 (MCOCA) is a law enacted by Maharashtra state in India in 1999 to combat organised crime and terrorism.  The preamble to MCOCA says that "the existing legal framework, i.e. the penal and procedural laws and the adjudicatory system, are found to be rather inadequate to curb or control the menace of organised crime.  Government has, therefore, decided to enact a special law with stringent and deterrent provisions including in certain circumstances power to intercept wire, electronic or oral communication to control the menace of organised crime."

Punjab Control of Organised Crime Act: Punjab Control of Organised Crime Act, (PCOCA) is law to be enacted by Punjab state in India to combat organised crime.  It is in process of approval as the Punjab Cabinet has yet not given its approval on account of few reservations about various clauses of the Act.The Act is designed on the pattern of Maharashtra Control of Organised Crime Act enacted in 1999.

Supporting paragraphs: The Krays (film) Kray twins
Answer: Philip Ridley