Subscribe | UPI Odd Newsletter Subscribe MOSCOW, Nov. 15 (UPI) -- Russian police said they are pursuing criminal charges against the protester who nailed his scrotum to the cobblestones in Moscow's Red Square. Moscow's Interior Ministry said Friday police have opened a hooliganism investigation into Pyotr Pavlensky's Nov. 10 stunt, which involved the shock artist stripping nude and nailing his scrotum to the Red Square cobblestones as part of a performance he dubbed "Nail," RIA Novosti reported Friday. Advertisement Pavlensky said the stunt was a protest against what he described as apathy and political indifference among the country's citizens. Police said Pavlensky could face up to five years in prison if he is tried and convicted. Investigators had initially sought petty hooliganism charges against Pavlensky the day after the incident, but a judge ruled the documents submitted by police did not support the criminal accusations. Read More Judge: No charges for scrotum-nailing protester Woman accused of bare-hand castration