A major plotline on the fictional HBO drama The Sopranos was the U.S. Federal Bureau of Investigation's ongoing pursuit of the DiMeo (New Jersey) and Lupertazzi (Brooklyn) crime families. The Bureau's investigations met with varying degrees of success. This article lists both characters who acted as F.B.I. informants and F.B.I. agent characters and as such is an expansion of the main article List of The Sopranos characters.
Being an F.B.I. informant on The Sopranos is a risky proposition, often ending in death. Lupertazzi crime family consigliere, James Petrille, and Soprano family capo, Carlo Gervasi, are the only known F.B.I. informants to survive until the series' end. Raymond Curto deserves notice for being a longtime informer before dying of natural causes without ever being suspected. Listed below are characters who are known to have been F.B.I. informants and their respective fates. Note that Albie Cianflone was likely an informant, but he should not be included on the list because his cooperation (if any) is debatable, unconfirmed and unknown.
FBI chief of New Jersey division who is constantly looking for new insight on the ongoing Soprano/DiMeo case. He successfully coordinates a mission to put the Soprano residence under surveillance by the use of an old lamp in their basement. The operation ends when Meadow takes the old lamp to college. When Tony is arrested for the stolen airline tickets he tells Frank to "not expect any more deli trays coming your way", alluding to a deli tray sent to Cubitoso on his birthday, which Cubitoso donated to a local charity. He also pressures Adriana La Cerva into wearing a wire, which leads to her confession and eventual death. When Agent Sanseverino worries after Adriana disappears, Cubitoso decides it is time to move on. He was also the agent whose idea it was to bug Green Grove Retirement Community when Tony Soprano and several other DiMeo family capos move in their mothers, despite other agents' skepticism.
Agent Harris' new partner in the Joint Terrorism Task Force. Along with Harris, he approached Tony at his home, requesting that Tony inform them should he come across any terror-related information in his line of work. When asked by Tony about how the war on terrorism goes, Ron mentions that he didn't mind working on the task force other than not sleeping and that he missed his wife and children. Harris would often bring Goddard to Satriale's to ostensibly show him that the store makes the best pulled pork sandwiches in the state.