Eileen Elizabeth Sheridan was known for her association with a firm headed by  English gangsters who were the foremost perpetrators of what in the East End of London?
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.
Gordon Cummins Gordon Frederick Cummins (18 February 1914 – 25 June 1942) was a British spree killer, convicted for the murder of one woman in London and charged with the murder of three more. The murders took place over a six-day period in February 1942, during World War II. Cummins, a Royal Air Force serviceman during World War II, was known as the Blackout Killer or Blackout Ripper due to a comparison to Jack the Ripper, as both killers mutilated their victims.