http://articles.boston.com/2011-08-12/news/29881074_1_fbi-informant-crime-ring-wiretap Reputed mob boss is called FBI informant Court papers say state was wiretapping Rossetti August 12, 2011|By Milton J. Valencia and Shelley Murphy, Globe Staff Mark Rossetti, a reputed Mafia leader who was indicted last year on state charges of running a sprawling criminal enterprise of drug trafficking, gambling, and loan sharking, had been working all along as an informant for the FBI, according to documents filed yesterday in Suffolk Superior Court. The documents, filed by two lower-level players in Rossetti’s alleged crime ring as part of a legal strategy in their own case, do not identify Rossetti by name. But he can be clearly identified through descriptions of his conversations with his FBI handler, and through a State Police organizational chart of his alleged crime ring, the Rossetti Criminal Organization. Rossetti is a reputed capo in the New England Mafia. State Police recorded more than 40 conversations between Rossetti and his FBI handler in the spring of 2010, through a wiretap on Rossetti’s FBI-issued phone, according to the court documents. In the conversations, they discussed other Mafia figures and the possible role of Rossetti’s cousin in the 1990 art heist at the Isabella Stewart Gardner Museum, as well as Rossetti’s debt collections. According to the documents, it was during these conversations that State Police discovered Rossetti was an FBI informant. Rossetti later grew concerned that he was being investigated by the State Police. He revealed to his handler on May 14, 2010, that his phone had been tapped, according to court records. The disclosure that Rossetti, a high-ranking Mafioso, was working with the FBI at the same time he was being targeted by the State Police raises questions about how closely the FBI was monitoring him and whether the bureau was aware of the extent of his alleged activities. The complete nature of Rossetti’s relationship with the FBI was not immediately clear yesterday. When working with informants, the bureau is required to follow clear guidelines that restrict what the informant may do. Gregory Comcowich, a spokesman for the FBI’s Boston office, said last night that he was aware of the court filings but would not comment on details of Rossetti’s relationship with the bureau. “The Department of Justice rules require us to report criminal wrongdoing by any of our sources,’’ he said. “The FBI followed those guidelines.’’ According to court documents, Rossetti expected to be spared from prosecution for the crimes he committed with the FBI’s knowledge, but he worried for his safety if it appeared he was getting special treatment from authorities.