stool pigeon
stool pigeon. Slang. 1. An informant, esp. a police informant. 2. A person who acts as a decoy, esp. on behalf of a gambler or swindler, or for the police to help make an arrest. — Also termed (in sense 1) rat; (in sense 2) capper.
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capper
capper. 1. One who solicits business for an attorney. See BARRATRY(1); RUNNER (2). 2. Slang. A person who acts as a lure for others (as in a gambling or confidence game). — Also termed (in sense 2) stool pigeon.