There is a wonderful article in the New York Review of Books 2 July 2009 Issue; 'When Hollywood Dared' describing the films, new with sound, before the 1934 Production Code came to rule. I have not had a chance to look through the data base here to see if they are included or not ( the article mentions about 40 or 50 that I will check on when I have a chance )
here is, I hope, a good link to it ( unfortunately the link is only good to the first portion of the article, one must be a subscriber to read the remaining bulk of the article ):
http://www.nybooks.com/articles/article-preview?article_id=22790
I often wondered about the sugar coating found in films afterwards and this article, at least to me, explains the reasons.
I love some of the titles:
Merrily we go to Hell
Other Men's Woman
Wild Boys of the Road
Blondie Johnson
Strangers Kiss
Employee's Entrance
Naughty Flirt ( any title with 'Naughty' in it, does it for me )
the all sound like Noir, and from the article's vantage, they were, for Noir I think, exposes some very raw edges ( emotions/motivations/doom ) missing from other films of the same periods.
( I still cannot link films while using Google Chrome browser )