You can find the transcripts online if you hard enough, it's all public domain.

Personally I find the testimony non-mobsters who are testifying the most interesting. They provide some names of minor associates/member and detail shakedowns known to them that are less well known to history. It's also interesting that though the stereotype is that all big made guys "took the fifth" and said nothing, a lot of guys actually gave the committee a lot of information, but of course nothing really of substance that would end up getting them convicted of anything.

I was also surprised to find out that according to the committee how close the Buffalinos were linked to Detroit in the coin-operated machine businesses, Russel Buffalino a piece of lot of Detroit and I think some Cleveland businesses. I always thought of them as Buffalo-Philadelphia-Genovese aligned.