It really depends on the people who are interested but for the more borderline I've seen suggested Angela Davis's Gender Race and Class or Michael Parenti's Blackshirts and Reds and then Engels The principles of communism.

The new deal was not a victory it was a failure. It was a policy passed to placate and divide white settlers from the global working class. And BIPOC folks in the states didn't benefit and that was intentional. Reform is not a win it is a loss. It further prevented any revolutionary action. Next you'll be claiming the US's work around making it easier for white workers to own homes is a win.

Reading USUs articles on organizing was a real eye-opener for me. It completely shifted my perspective and made me reconsider wanting to join CPCanada (among other reasons I learned later not to join) and instead focus my energy on starting a study group in my local area. If you’re interested in organizing outside a party I highly recommend reading this guide by USU. Guide to organizing

This guide to organizing to build a party is the closest I've seen by USU https://en.prolewiki.org/wiki/Category:Guide_to_organizing (prolewiki hosts it but USU made this guide)