The rise of Nazi Germany: Did the prevalence of hunting and singing clubs help Nazis come to power?.

It’s an interesting idea, that “network capital” can lead to horrific social policies (a la the Holocaust). That’s not to demean the potential benefits of social clubs. But the potential of these organizations to be used to exclude, demean, or demonize the “other” is pretty well established. In extreme cases you have more immediate effects (e.g. mob mentality violence) but this article hints and potential slow-building, long term effects.