SNITCHING and RATTING are really two different animals.

This is very grey..

Case in point if you believe Donnie Brasco when the Bonnnano's opened that bar in FL,

They got shut down when supposedly the boss from N.Y. called up Trafficante and asked him to shut these guys down.

Trafficante supposedly had the local cops go in and bust up the place....

Now does that make TRAFFICANTE a rat?

No

Did he snitch?

I would.have to say YES
What else would you call it?

Again if the story is true

Did he break OMERTA?

I would say yes

Different shades of grey
When you are talking about ratting, snitching and breaking OMERTA

Very common back in the day in N.Y.C
The local police precients were all PAID off by local wise guys to look the other way etc.

Did those guys paying, ever drop a dime on their competition? I would say YES...

We're they rats? NO
Did they SNITCH YES
Break OMERTA? LOL only if they admitted it. But technically YES..