Were these Moslims or Muslims?
Home grown converts or the imported variety?
Theres a clue here:
"There were scattered books, including "The Autobiography of Malcolm X,"
I'm guessing its NOI types.
I would suspect there was a little bit of both involved. It sounds like most of the ones mentioned in this article were Black Muslims (like the earlier group arrested in the Pacific Northwest). Another article I read mentioned some African-born Muslims, as well, so it seems it was a joint effort.
Sounds like the black variety to me.