However, as a result of the violence often practised in the Copa Libertadores by Argentine and Uruguayan clubs during the 1960s, disagreements with CONMEBOL, the lack of financial incentives and the violent, brutal and controversial way the Brazilian national team was treated in the 1966 FIFA World Cup by European teams, Brazilian football—including its club sides—declined to participate in international competitions in the late 1960s, including the Copa Libertadores and consequently the Intercontinental Cup. During this time, the competition became dogged by foul play. Calendar problems, acts of brutality, even on the pitch, and boycotts tarnished its image, to the point of bringing into question the wisdom of organising it at all.