Do you even read the links you post or you just go by titles? LOL According to your last link, it was not a "black book-reading group". The community space was holding a small public gathering to celebrate “Red Books Day,” which is recognized around the world to celebrate the anniversary of the publication of the Communist Manifesto.
Community members submitted French, German, Russian, Ukrainian, Turkish, Georgian, Spanish, Hindi, Punjabi, and Odia recordings of sections of the Manifesto to share with each other. There were several Party for Socialism and Liberation and Democratic Socialists of America members, and other community members present in the audience.
I understand your concerns but I wouldn't worry if I were you. I bet at least half of these "white supremacists" are undercovers working for the DOJ/CIA.