Athletes must qualify before they take part in the Olympic Games. They are chosen by the country in which they are . For many years only amateurs were able to compete in the Olympics but today most athletes are professionals who their money through sport.In the history of the modern games have often played a major role. Adolf Hitler abused the 1936 Berlin games to how powerful Nazi Germany was. In the Munich Olympics of 1972 Arab terrorists took Israeli athletes as . They died when German police forces tried to free them.The USA and many western countries the 1980 Olympics in Moscow because the Soviet Union had Afghanistan a year earlier. Four years later, Communist countries stayed away from the games in Los Angeles.