"Bulger" typically refers to James "Whitey" Bulger, an infamous American mobster who led the Winter Hill Gang in Boston. He was involved in various criminal activities, including extortion, racketeering, and murder. Bulger was a fugitive for 16 years before being captured in 2011, and he was later convicted on multiple charges. Bulger's life has been the subject of numerous books and films, highlighting his criminal exploits and the complex relationship with law enforcement. His story is often associated with the FBI and the controversial practices of informants, as he was an informant for the agency while simultaneously running his criminal operations.