Question: The fighter who gave Don Adams his first bare knuckle defeat was frequently associated with which infamous London criminals ?
Context: John Morrissey (February 12, 1831 – May 1, 1878), also known as Old Smoke, was an Irish American bare-knuckle boxer and a Dead Rabbits gang criminal leader in New York City in the 1850s and later became a Democratic State Senator and U.S. Congressman from New York, backed by Tammany Hall.  Morrissey began his bare-knuckle boxing career after a confrontation with a man known only as "Chroel" who was notorious for troubling his fellow townsmen.  Although Morrissey was on the bitter end of his first bare knuckle bout, his display of bravery and fortitude earned himself the respect and historical acknowledgment of his peers. "Big Strong Man" or "My Brother Sylveste" is an English-language folk song, commonly associated with Ireland and performed by Irish bands.  It's not known when the song was originally written, but the date might be reflected in the references to the "Jeffries-Johnson fight" of 1910, American boxer Jack Dempsey, who started boxing in 1914, and to the RMS Lusitania which was in service from 1907 to 1915.  It's also not known who wrote it, or even if it came from Ireland or another country, but having "lived in a caravan" might indicate the main character is from the Irish Traveller community – a community renowned for its boxers, both bare knuckle and professional.  The song was popular with Canadian soldiers in World War II. The Bare Knuckle Boxing Hall of Fame is a museum and hall of fame in Belfast, New York, dedicated to the sport of bare-knuckle boxing.  It is housed in barns that were once owned by the Greco-Roman wrestling champion and physical culture pioneer William Muldoon.  The heavyweight boxing champion John L. Sullivan, who fought in both bare-knuckled and gloved boxing contests, trained in these barns under Muldoon's guidance for his championship bout against Jake Kilrain in 1889.  The barns were originally across Main Street from their current location, on the grounds of the Belfast United Methodist Church.  They were bought, moved, and restored by Scott Burt when the church became no longer interested in maintaining them.  Burt opened the Hall of Fame in 2009, when it had its first induction class. Streets of Rage (ベアナックル 怒りの鉄拳 , Bea Nakkuru: Ikari no Tekken , "Bare Knuckle: Furious Iron Fist") is a side-scrolling beat 'em up video game developed and published by Sega in 1991 for Mega Drive/Genesis.  It is the first installment of the "Bare Knuckle/Streets of Rage" series which was followed by "Streets of Rage 2" and "Streets of Rage 3".  The game was converted to Game Gear, Sega CD and Master System.  In 2007, the game was released for the Wii's Virtual Console in North America and Europe, and in 2009 it was released for the iOS via the App Store.  It was again made available as part of Sonic's Ultimate Genesis Collection in 2009 on both the PlayStation 3 and Xbox 360 consoles. Gary Alexander is an American martial artist, karate fighter, author and actor.  He was Black Belt Magazine's Co-Instructor of the Year (1974) and is known as the "First International Bare Knuckle Contact Karate Champion. Don "The Bull" Adams was a bare-knuckle boxer, from Waltham Cross, Hertfordshire, England.  In addition he was known as King of the Gypsies.  At least one of his fights was detected by the authorities.  Hertfordshire Constabulary reported a planned fight at Holborn Stud Farm on Sunday, 26 October 1975, between Don “The Bull” Adams and Roy “Pretty Boy” Shaw, promoted by Adams’ trainer Tom “The Bear” Brown.  Donny Adams's second for the fight was an Ex RAF policeman named Huw Rees.  This fight was banned, but must have taken place later, as Shaw was reported later to have beaten Adams.  Shaw won the bout in the first round.  Before that fight Adams had 48 bare knuckle fights and won them all. Streets of Rage (ベア・ナックル , Bea Nakkuru , "Bare Knuckle") is trilogy of a beat 'em up video games developed and published by Sega in the first half of the 1990s.  The series centers on the efforts of several heroes to rid a troubled city from the rule of a crime syndicate. Bare Knuckle Pickups (Bare Knuckle), founded in 2003 by former Elkie Brooks and Iced Earth guitarist Tim Mills, is a privately owned business based in the South West of England, UK, specialising in hand-wound electric guitar pickups. Shannon Grey Ritch (born September 27, 1970) is an American professional mixed martial artist, boxer, professional wrestler and kickboxer, known for being the former Gladiators Challenge Heavyweight Champion and KOTC Middleweight Champion also current RUF Interim Heavyweight Champion and IFC Middleweight Champion.  A professional competitor since 1998, Ritch has competed for the MFC, Pancrase, K-1, PRIDE, Rebel Fighting Championship, King of the Cage and the WEC.  Ritch has also has been featured in two episodes of Walker, Texas Ranger as a Biker Gang Member and a character named Knight, Choke in 2011 as an extra, CSI Las Vegas as Thug #2, an episode of iCarly as a MMA Fighter, an episode of Numbers in 2010, an episode of Ultimate Soldier Challenge on the History Channel representing a military contracting company and most recently in 2017 the direct to DVD film, directed by Robert Parham, Bullets, Blades and Blood and upcoming in 2018 No Way Out directed by Jeffrey D. Parker.  Shannon claims he has over 200 professional MMA fights 112 wins, 88 losses and 2 draws, some fights going undocumented and dating back as far as 1991.  His documented record of fights goes back to 1998 with a record of 56 wins, 81 loses, and 4 draws.  Shannon also holds a 2-1 record in professional boxing and a 25-2 record in bare knuckle boxing with all of his wins coming by way of knockout, in 2017 he was inducted into the Bare Knuckle Boxing Hall of Fame and also plans to round out his boxing career in 2018 against boxing superstar Bobby Gunn.  Ritch is also an occasional professional wrestler, recently in mid 2017 main eventing a card in Guyana.  Shannon has also found success as a grappler winning multiple NAGA, Grapplers Quest and Abu Dhabi Combat Club competitions, most recently winning a gold medal in the super heavyweight division at the Grand Canyon 2017 BJJ Open in Arizona and a silver medal at the '17 Arizona State BJJ Championships.  Ritch is also an avid golf player, winning 1st place in many state and pro am competitions held within his native Arizona as recent as 2017. Royston Henry Shaw (11 March 1936 – 14 July 2012), also known as Roy "Pretty Boy" Shaw, Roy "Mean Machine" Shaw and Roy West, was an English millionaire, real estate investor, author and businessman from the East End of London who was formerly a criminal and Category A prisoner.  During the 1970s–1980s, Shaw was active in the criminal underworld of London and was frequently associated with the Kray twins.  Shaw is best remembered today for his career as a fighter on the unlicensed boxing scene, becoming an arch-rival with Lenny McLean.
Answer: the Kray twins.