The Flying Fathers, a Canadian group of Catholic priests, regularly toured North America playing exhibition hockey games for charity. One of the organization's founders, Les Costello, was a onetime <answer>NHL</answer> player who was ordained as a priest after retiring from professional hockey. Another prominent exhibition hockey team is the Buffalo Sabres Alumni Hockey Team, which is composed almost entirely of retired <answer>NHL</answer> players, the majority of whom (as the name suggests) played at least a portion of their career for the Buffalo Sabres.
What league were most members of the Buffalo Sabres Alumni Hockey Team from?
NHL