supergrass

/ ˈsuːpəˌɡrɑːs /

noun

1. an informer whose information implicates a large number of people in terrorist activities or other major crimes

Example Sentences

The supergrass replied: "No I gave his name because he was responsible for the shootings on North Queen Street."

From BBC

The supergrass also told Belfast Crown court that he foiled a plan to kill 19 Catholic men in a work minibus in June 1994.

From BBC

A planned trial collapsed in 2011, after a judge ruled so-called supergrass evidence could not be used in the case.

From BBC

Police work with three supergrass witnesses - criminals who are giving information.

From BBC

Terence Stamp is the supergrass ex-criminal exiled in Spain who finds that old comrades have caught up with him, intent on settling scores.

From The Guardian