Thanks to a pointer to the Mercury Theater on the Air site from Lloydville of mardecortesbaja.com.
Amongst many broadcasts from this famous Orson Welles radio-play project, is a 1939 radio adaptation of Dashiell Hammett’s novel, The Glass Key, which was adapted for the screen in 1935 and again in 1942.
You can download an MP3 of the original broadcast from the Mercury Theater on the Air site.
FilmsNoir.Net 
A highlight of this broadcast is a discussion after the radio-play between Welles’ the then warden of Sing-Sing prison, who had some very cogent and liberal things to say on why crime was on the rise in 30’s America.
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