A police informer.
A police informer is a person who provides privileged information about a person or organization to an agency. They are often called confidential or criminal informants (CI).
Police Story - 1973 Requiem for an Informer 1-2 was released on: USA: 9 October 1973
He asked her to find someone kill an informer.
a person acting as a decoy or an informer,especially for the police
A beefer is a slang term for a police informer, or a cow used for beef and not milk.
Hi,You better check this URL 4 more info to become a police informant www.associatedcontent.com/.../guide_to_becoming_a_confidential_informant.HTML
The term is usually used to mean a person who is not a police officer that regularly gives information about crimes to the police.
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In British slang to act as a police informer, also someone who complains irritatingly. In Australia to annoy or upset or nag
a nark is a slang word for 'informer' especially to the police. Or generally to inform against someone
In Australian idiom, a "snitch", an informer, someone who runs to authority to tell tales. Also found as a verb "he was dobbed in to the police".