La curva is the section where the Atalanta ultras - extreme fans - watch games and on Sunday violence erupted there, forcing the abandonment of the game against AC Milan.
"The scenes we saw in Bergamo should never be seen in the football world," said Ruggeri. "I want to state that on Sunday, there were 24,000 people at the stadium in Bergamo and 20,000 have turned against the curva and this is an important sign."
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