And even the mayor of Naples got involved, so enraged were supporters.
Paulo Dybala fired in a pair of second-half penalties amid furious protests from Napoli players.
The Argentinian hitman seemed to take a dive for the first, moments into the second half, before dusting himself down to net the leveller.
Gonzalo Higuain put Juve ahead before Valeri pointed to the spot a second time when Pepe Reina was adjudged to have fouled Juan Cuadrado, only for replays to shows that the former Liverpool keeper touched the ball before wiping out the Colombian.
To make matters worse, the second came as Juve broke with Napoli still appealing for what looked like a stonewall penalty to them after Raul Albiol was chopped down.
Napoli director Cristian Giuntoli described the performance of the whistler Valeri as “shameful and damaging to all Italian football”.
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City mayor Luigi De Magistris then weighed in with a statement.
It read: “Yesterday in Turin we suffered once again from an injustice, a game that was full of, and influenced by, repeated refereeing mistakes.
“It was a disgrace on top of disgrace.”
Sky Sports report that Napoli are now considering throwing in their kids for the second leg in protest.
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