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I'm certain Team Bondi have done a whole lot of research for their L.A Noire title, but I'm sure even they'd appreciate this particular source of information.
It's a seven part documentary of the Gangsta Squad, a secret LAPD unit formed after World War II, compiled by none other than the Los Angeles Times and titled.. ...wait for it... L.A Noir: Tales from the Gangsta Squad. There's quite a lot of media, photos, and written up accounts to read through in this series, so if you're fascinated by that era of organised crime or highly anticipating Team Bondi's L.A Noire, then be sure to follow up this series as it'll probably give you a good feel for the kind of atmosphere that Team Bondi will be offering.