Question: What nationality was the boxer who defeated Len Buchanan in 1972 ?
Sentence (from "Johnny LoBianco"): 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.
Relevant evidence: Yes