There are snitches in every group, it is surprising because he testified in open court, but I guarantee almost every gangster snitches sometimes. Most of them do it secretly but there are a few guys have never given up any information that would be considered snitching. Most groups have different rules on what they consider to be snitching. Surenos are not even supposed to speak on camera, or they could get whacked.
The Tongs are tight nit group. They don't deal much with outsiders as far as I know. Its a really old Chinese tradition, they might not care as long he didn't snitch on any of the current members.

I've been told that if Whitey Bulger were to ever be on the streets again, we would be welcome back to South Boston. I could be wrong on that, but I did hear it.