The 17 Orthodox nuns received a caution for causing a public nuisance during a procession in Iasi for the naming of a new bishop.
Thousands of people attended the procession for the new bishop of Moldova and Bucovina.
Police spokesperson Virginia Pralea said: “The nuns were brought to the police station for nuisance and uncivilised behaviour. When addressed by the police, they called the officers ‘sons of Judas’.” The nuns were released two hours later after being identified and given a written warning.
They are known for their critical views of the country’s church leaders who they accuse of living in luxury while their followers struggle in poverty.