Always read that to bring someone in to LCN circle, that a made man/ associate had to vouch for the person he's ' bringing in '. You're responsible for their actions etc.. on pain of death if that person turns ' bad' eg rats , does something that brings heavy LE heat.
So, any cases where someone paid the penalty?
Can only think of donnie brasco and sonny red and lefty ( if he had stayed on streets).

I wonder if it applied to associates or short term members. I think in cases like Scarpa the rat, he was around so long whoever vouched for him may have been dead. Also if a person is made a long time before turning rat, the sponsor may be forgiven since everyone by that point everyone else had accepted the member who becomes a rat.

Tony Mirra was also supposedly killed over the "Brasco fiasco". He actually was the first made guy in the Bonannos to connect with Pistone. He even asked for a sitdown to have his claim on Brasco recognized,
His uncle, Al Embarrato (AKA Al Walker),was one of the shooters.

Its another myth. Apart Donnie Brasco case,nobody was killed because sponsored a rat because the members flipped decade after be inducted so would be useless to kill a wiseguy because between many men he sponsored someone flipped.