Dwalin is right. In black mass is said that the fbi after Hoover for year said that the mob didn't exist tried everything to destroy the LCN families,plus bulger was a connolly idol when he was a child in southie so when connolly asked bulger to be an informant they speaked the same language aka was both irish,growned in southie and hate the italians. In the book is explained as connolly and his supervisor Morris was the real moles and helped to made fail more state police cases against the winter hill. In the 1970s and 1980s say that an fbi agent was corrupt was a blasfemy but was true.
Flemmi and bulger even gave 1000 or 2000 € for pay the airplain ticket to the Morris mistress or reach him because was in another state.
Bulger informations was nothing because as flemmi who was close to the Angiulos.