The advent of the state-sponsored "full-time amateur athlete" of the Eastern Bloc countries eroded the ideology of the pure amateur, as it put the self-financed amateurs of the Western countries at a disadvantage. The Soviet Union entered teams of athletes who were all nominally students, soldiers, or working in a profession, but all of whom were in reality paid by the state to train on a full-time basis. The situation greatly disadvantaged American and Western European athletes, and was a major factor in the decline of American medal hauls in the 1970s and 1980s. As a result, the Olympics shifted away from amateurism, as envisioned by Pierre de Coubertin, to allowing participation of professional athletes, but only in the 1990s, after the collapse of the Soviet Union and its influence within the International Olympic Committee.