From then until the demise of the Soviet Union in 1991, the "Red Machine" (; "Krasnaya Mashina") was one of the most dominant teams in international play, winning nearly every World Championship and Olympic tournament, as well as defeating many teams with professional players, such as in the 1974 Summit Series, the Super Series, and the 1981 Canada Cup. Until 1977, professional players were not able to participate in the World Championship, and it was not until 1988 that they could play in the Winter Olympics. The Soviet team was populated with amateur players who were hired by Soviet enterprises (aircraft industry, food workers, tractor industry) or organizations (KGB, Red Army, Soviet Air Force) that sponsored what would be presented as an after-hours social sports society hockey team for their workers but were set-up for the athletes to train full-time. This type of amateur player was contested by Canada and the United States whose best players were participating in professional leagues.