The Player (1992)

A studio script screener gets on the bad side of a writer by not accepting his script. The writer is sending him threatening postcards. The screener tries to identify the writer in order to pay him off so he'll be left alone, and then in a case of mistaken identity gone awry, he accidentally gives the writer solid ammunition for blackmail. This plot is written on a backdrop of sleazy Hollywood deals and several subplots involving the politics of the industry.