informer

There is something about a healthy personality that feels repelled by a snoop, a snitch, a stool pigeon, an informer.

"I think that's probably the only way it's going to be solved - someone on the inside becomes an informer."

It will also introduce extra powers for investigators, and a special protected status for informers.

Martin was described as an informer within the IRA.

One of them was a BBC report from 1987, which featured a clip from a news conference in which Mr Adams spoke about the murder of Charles McIlmurray, whom the IRA claimed was an informer.