Wymette does not give any proof of DiFronzo being an informant. he just answers yes and is not asked for proof or sources. I would not take his word for it so quickly.
I would assume his sources are the FBI agents he worked w for 30 years
The FBI will not reveal a secret informer another informer who is in the open, or to another secret informer. So he is just making it up
The fbi also doesn’t use informants who commit violence, oh that’s right never mind.....