Question:  Richard Green was referee for several major bouts including which American professional boxer and activist? 
Context: Franklin Roy "Frank" Bruno, {'1': ", '2': ", '3': ", '4': "} (born 16 November 1961) is a British former professional boxer who competed from 1982 to 1996.  Bruno had a highly publicised and extremely eventful career.  The pinnacle of his boxing career was winning the WBC heavyweight title, in what was his fourth world championship challenge.  He also held the European heavyweight title earlier in his career.  Bruno was one of the most well-loved and recognisable boxers in British history, and faced multiple top-rated heavyweights during his career including two bouts with Mike Tyson and a domestic clash against Lennox Lewis.  He won the WBC title in 1995 after defeating Oliver McCall at a packed Wembley Stadium.  Bruno was known for his excellent punching power: he won 40 of his 45 bouts and 38 by knockout, giving him a 95% knockout rate from the fights he won; his overall knockout percentage is 84.44%.  Like Henry Cooper before him, Bruno has remained a popular celebrity with the British public following his retirement from boxing. Lance Revill (born 30 August 1953) is the former president of the New Zealand Professional Boxing Association (NZPBA), a New Zealand boxing promoter, referee, and a former New Zealand professional boxer.  Revill compiled a professional record of 21 wins and 13 losses, with 13 knockouts, in light heavyweight bouts fought in New Zealand and Australia between 1974 and 1990. Paul Fritsch (25 February 1901 – 22 September 1970) was a French featherweight professional boxer who competed in the early 1920s.  In 1920 he became the first French boxer to win an Olympic title, defeating teammate Jean Gachet in the final, despite losing to Gachet at the national championships before the Olympics.  After more than 300 amateur bouts, Fritsch turned professional in 1921.  He fought approximately 100 more bouts, but never won a major title.  He retired from boxing in 1929 due to a retinal detachment and became a car salesman. George Curtis (April 9, 1925 – May 13, 2004) was a professional boxer, referee and business owner who was licensed to officiate bouts in Las Vegas, Nevada. Guglielmo Papaleo (September 19, 1922 – November 23, 2006) was an American professional boxer, better known as Willie Pep who held the World Featherweight championship twice between the years of 1947 and 1950.  Pep boxed a total of 1,956 rounds in the 241 bouts during his 26-year career, a considerable number of rounds and bouts even for a fighter of his era.  His final record was 229–11–1 with 65 knockouts. Pep, known for his speed, finesse and elusiveness, is considered to be one of the best fighters of the 20th century and was inducted into the International Boxing Hall of Fame in 1990.  Pep was voted as the #1 featherweight of the 20th Century by the Associated Press and ranked the #1 featherweight of all-time by the International Boxing Research Organization in 2005. Muhammad Ali ( ; born Cassius Marcellus Clay Jr.; January 17, 1942 – June 3, 2016) was an American professional boxer and activist.  He is widely regarded as one of the most significant and celebrated sports figures of the 20th century.  From early in his career, Ali was known as an inspiring, controversial, and polarizing figure both inside and outside the ring. Anthony George Charles (born 27 June 1900 in Castries, Saint Lucia; died 20 April 1957) was a boxer, commonly known as Dixie Brown.  He worked on the construction of the Panama Canal and emigrated to Cardiff, Wales in 1919.  In the West Country of England, he survived by working as a bare-knuckle boxer in fairground booths.  He moved with his wife, Lily Sellick, to Bristol in 1923, and registered as a professional boxer, fighting 85 bouts in the 1920s and 1930s, as welterweight and middleweight.  He trained at the White Horse in Milk Street.  He could not contest any British championships owing to the colour bar then in operation.  He had two wins, both over one-time champion Billy Green, five losses and two draws in his professional career. LaMar Clark (December 1, 1934 – November 5, 2006) was an American professional boxer who fought as a heavyweight boxer.  He was active from 1958 to 1961 and fought a recorded 46 times in his 3 year-career.  Clark has the current record of most consecutive knockouts at 44 (including unsanctioned bouts). Richard Green (c. 1937 – July 1, 1983) was a professional boxing referee.  He officiated several major bouts, such as Muhammad Ali-Larry Holmes in 1980.  He was the referee for the lightweight world title fight between defending champion Ray Mancini and challenger Duk Koo Kim, which left Kim dead shortly after the fight ended.  Green committed suicide several months later. James Joseph "Gene" Tunney (May 25, 1897 – November 7, 1978) was an American professional boxer who competed from 1915 to 1928.  He held the world heavyweight title from 1926 to 1928, and the American light heavyweight title twice, from 1922 to 1923.  A highly technical boxer, Tunney had a five-fight rivalry with Harry Greb in which he won three, drew once, with one loss.  He also knocked out Georges Carpentier and defeated Jack Dempsey twice; first in 1926 and again in 1927.  Tunney's successful title defense against Dempsey remains one of the most famous bouts in boxing history and is known as The Long Count Fight.  He retired undefeated as a heavyweight after his victory over Tom Heeney in 1928, after which Tunney was named Fighter of the Year by "The Ring" magazine.
Answer: Muhammad Ali