British crime bosses

Owen Vincent Madden (December 18, 1891 – April 24, 1965), known as Owney Madden and nicknamed "The Killer", was a leading underworld figure in Manhattan, most notable for his involvement in organized crime during Prohibition. He also ran the famous Cotton Club and was a leading boxing promoter in the 1930s.

Ronald "Ronnie" Kray (24 October 1933 – 17 March 1995) and Reginald "Reggie" Kray (24 October 1933 – 1 October 2000), twin brothers, were British criminals, the foremost perpetrators of organised crime in the East End of London during the 1950s and 1960s. With their gang, known as "The Firm", the Krays were involved in murder, armed robbery, arson, protection rackets and assaults.

Adam Worth (1844 – 8 January 1902) was a German-born American criminal. Scotland Yard Detective Robert Anderson nicknamed him "the Napoleon of the criminal world" (because of his short stature). He is widely considered the inspiration for Sir Arthur Conan Doyle's fictional criminal mastermind James Moriarty in the Sherlock Holmes series, whom Conan Doyle calls "The Napoleon of Crime".

Thomas "Tommy" Anthony Comerford (1932, Liverpool - 2003, Liverpool) was an English organised crime figure involved in narcotics and drug trafficking, one of the first criminals to establish an international drug trafficking network in England.

Arthur Thompson (September 1931 – 13 March 1993) known as "the Godfather", was a Scottish gangster who was active in Scotland in the 1950s. He then went on to take charge of organised crime for over thirty years. He was born in September 1931 in the industrial area of Springburn, Glasgow. He died at the Glasgow Royal Infirmary on 13 March 1993 from natural causes – a heart attack – at the age of 61.

Robert "Bobby" Cummines OBE, FRSA (born 23 November 1951) is an English former hitman who was chief executive of UNLOCK, The National Association of Reformed Offenders until March 2012. Formerly one of the United Kingdom's most notorious bank robbers, he rejects the designation of gangster as stated on "The True Geordie Podcast". He is currently the CEO of Vision Housing Consultancy Service.

Walter Douglas (born 1961) is an alleged Scottish drug trafficker and organised crime figure, dubbed the Tartan Pimpernel by the press, who is reportedly one of the richest in the United Kingdom with an estimated worth of £20 million. He was allegedly wanted in at least three countries on drug trafficking and gun running charges as of 2003, and Douglas was reported to have had ties to numerous international criminal organisations in Europe and North America as the head of the Delta crime syndicate. But in fact nothing has ever been proved against Douglas. In October 2013 there were no longer any warrants out against him and he staunchly maintained his innocence to a British journalist

Thomas "Tam" McGraw (19 February 1952 – 30 July 2007), also known as "The Licensee" or "Wan-Baw McGraw", was a gangster involved in organized crime including extortion, narcotics and drug trafficking in Glasgow, Scotland.

Charles Hitchen, also mentioned as Charles Hitchin in other sources, (c. 1675 – 1727) was a "thief-taker" (private policeman) and under-marshal of the City of London in the early 18th century, also, famously tried for homosexual acts and sodomy offences. Alongside his former assistant and then a major rival Jonathan Wild, against whom he later published a pamphlet (The Regulator) and contributed to his sentencing to death, Hitchen blackmailed and bribed people and establishments irrespective of their reputation, suspicious or respectable. Despite the disgrace of the people he earned through his abusive exercising of his power, he remained in power and continued fighting against violent crime, especially after the ending of the war of the Spanish Succession and until 1727.