ROME — Pope Francis has a warning for Italy’s mobsters: They will go to hell if they don’t repent and renounce their “blood-stained money and blood-stained power.”

The pontiff Friday delivered his most forceful denunciation yet of organized crime. The occasion was a prayer vigil at a Roman church for relatives of innocents killed by the mafia, during which the names of 842 victims were read aloud.

After voicing his solidarity with the family members, Francis said he couldn’t leave the service without speaking to those not present: the “protagonists” of mafia violence. Addressing these absentee mafiosi, Francis was unsparing:

“This life that you live now won’t give you pleasure. It won’t give you joy or happiness,” he said. “Blood-stained money, blood-stained power, you can’t bring it with you to your next life. Repent. There’s still time to not end up in hell, which is what awaits you if you continue on this path.”

Francis has spoken out frequently about the evils of corruption, but this was his first major address to Italian victims of organized crime, who were gathering near Rome for an annual retreat organized by a mafia-fighting priest that takes place each March 21, the first day of spring.

The brutality of Italy’s mobsters was driven home this week by the death of Domenico Petruzzelli, a 2-year-old killed along with his mother and her companion in a mob hit in Taranto when assailants opened fire on their car.