 Complete the following phrase:  The mens tournament was first held at the 1920 Summer Olympics and integrated in the Winter Olympic program starting with the 1924 Winter Olympics. The Olympic Games were originally intended for amateur athletes, so the players of the NHL and other professional leagues were not allowed to play. Canada dominated the first three decades, winning six of seven gold medals. The Soviet Union first participated in 1956, and overtook Canada as the domit international team, winning seven of the nine tournaments in which they participated. The only two tournaments that the Soviets failed to win, in 