Technically, the recent top guys didn't flip, Manocchio, Limone, the DiNunzio's etc.

A couple of captains did Rossetti, DeLuca, Sonny Mercurio back in the 80's.

Salemme did after he learned that Flemmi had been informing on him for years and set out to specifically rat on Connolly and Flemmi. Bulger, Flemmi, Martorano were Winter Hill, not Italian Mob but they really were the cause for Salemme to flip.

Arillotta and Tranghese in Springfield seems to have decimated that area, but they are Genovese, not Boston. I'll defer to Southend on that area, that's his 'hood.