Two companies owned by agents of a leader of the Brothers' Circle, a European criminal coalition, were also listed.
"Today's action against key members of criminal organizations that engage in serious crimes around the world is a continuation of our systematic effort to expose and disrupt these dangerous groups and protect the U.S. financial system from their illicit activity," said David S. Cohen, undersecretary for terrorism and financial intelligence.
The Camorra members, including reputed mob boss Marco Di Lauro, who has been on Italy's "Most Wanted" list since 2004, have all been involved in recent violence in Naples, officials said. They also include Mario Riccio, a fugitive allegedly involved in large-scale drug trafficking; Antonio Mennetta, who was arrested in January and allegedly led a group of assassins; Mariano Abete, arrested on drug charges; and Rosario Guarino, arrested last year and suspected of a dozen killings.
The Brothers' Circle is a transnational group centered in countries of the former Soviet Union, officials said.
The two companies listed are Avuar 000, which has a business address in Samara, Russia, owned by Aleksandr Manuylov, and Guga Arm SRO, Karlovy Vary, Czech Republic, owned by Lazar Shaybazian. Manuylov, and Shaybazian were listed by the Treasury Department individually in February 2012 along with Vladislav Leontyev, described as a key member of the crime syndicate.