Question: What nationality was the boxer who defeated Len Buchanan in 1972 ?

<P0-S0> ECUARUNARI (in Kichwa: "Ecuador Runakunapak Rikcharimuy ", "Movement of the indigenous people of Ecuador"), also known as Confederation of Peoples of Kichwa Nationality ("Ecuador Kichwa Llaktakunapak Jatun Tantanakuy ," in Spanish "Confederación de Pueblos de la Nacionalidad Kichwa del Ecuador ") is the organization of indigenous peoples of Kichwa nationality in the Ecuadorian central mountain region, founded in 1972. <SEP> <P1-S0> Giovanni "Johnny" LoBianco (October 7, 1915 – July 16, 2001) was an American boxing referee for over 30 years, who was referee for a number of championship fights, including several that ended controversially, most notably Roberto Durán's successful 1972 dethroning of Ken Buchanan in which LoBianco ruled Durán the victor by knockout despite having appeared to have hit Buchanan with a low blow. <SEP> <P2-S0> Leonard "Len" Benker Johnson (22 October 1902 – 28 September 1974 (aged 71)) born in Clayton, Manchester was an English professional middle/light heavyweight boxer of the 1920s, and 1930s, who won the Australian version of the British Empire middleweight title in 1926. <P2-S1>  Johnson (who was of mixed race) was denied the opportunity to fight for championships in Great Britain because of the colour bar that existed in boxing at that time. <P2-S2>  He was managed by his father Bill Johnson. <P2-S3>  Johnson fought on boxing booths in the 1920s, and from 1930 to 1939 owned his own travelling booth. <P2-S4>  Just prior to the outbreak of World War Two Johnson briefly tried his hand at professional wrestling, but once war came he lost interest in both boxing and wrestling, and sold his booth. <P2-S5>  During World War Two Johnson was a member of the Civil Defence heavy Rescue Squad in Manchester. <P2-S6>  Len Johnson was also a member of the Communist Party of Great Britain (joining the party in 1944 and later writing a boxing column for the party newspaper "The Daily Worker"), a trade unionist, a community leader in Moss Side, a local civil rights activist, and attended the 5th Pan-African Congress in Manchester. <P2-S7>  Following the Second World War, he was a co-founder of the New International Society in Manchester, which provided a vehicle for black political and social self-organisation in the city and campaigning against racism at home and abroad, including organising a concert and a rally featuring Paul Robeson in support of the Trenton Six, which were both attended by 10,000 people. <SEP> <P3-S0> Roberto Durán Samaniego (born June 16, 1951) is a Panamanian former professional boxer who competed from 1968 to 2001. <P3-S1>  Durán was a versatile brawler and in-fighter in the ring, which earned him the nickname of ""Manos de Piedra"" ("Hands of Stone") for his devastating punching power. <P3-S2>  He is a four-weight world champion, having held titles at lightweight (1972–1979), welterweight (1980), light middleweight (1983–1984), and middleweight (1989), as well as reigns as the undisputed and lineal lightweight champion (1978–1979), and the lineal welterweight champion (1980). <P3-S3>  He is also the second boxer to have competed over a span of five decades, the first being Jack Johnson.