Isn’t threads a Twitter clone? Will it even effect Lemmy? For me personally I don’t use Mastodon, but I might if threads is successful. I use Twitter to follow famous people I like. If famous people move to the fediverse because of threads that will only make sites like Mastodon better in my opinion.
I think it was more that in the early days of the Nazi party they did accept socialists. It was more of a big tent party because they needed to attract members. Hitler was never a fan of socialism and as he gained power he purged the socialists from the party.