 As of 2020, four players have contributed to AFL I, one to AFL II, one to AFL III, two to the American Association, three to the Arena Football League, one to the Indoor Football League, eleven to the Canadian Football League, four to the World Football League, seven to the United States Football League, two to the Continental Football League, one for NFL Europe, one for the 1960s United Football League, and ten played for independent teams (several of which played in the NFL at some point.The Ohio League had five individuals contribute, the All-America Football Conference had fifteen, and the American Football League which merged with the NFL had thirty-nine Hall of Famers play for the league.Bill Polian founded the Alliance of American Football, but he was inducted into the hall in 2015 and the league started in 2019.