What are some anti-socialist arguments you hear which were refuted a long time ago in a book or speech?
I'm going to make a compilation, so specifically mention the work which answered the question. Bonus points for a direct link or quotation of a paragraph or two which directly refute the argument.
That's so broad, it's hard to immediately think of any. The common 100 million number is refuted by the Black Book of Communism itself, though, considering some of the writers disavowwed it and Conquest includes literal Nazis killed during World War II as "victims of communism," before you get into falsifications.
"It's always been like that". And variations thereof. Engels shows it's untrue in an extremely easy to digest fashion in "Origins of private property". All one has to do is bother to open the book.
The list is long
I've never really heard a good anti-socialist argument.
Because there isn't.