People in the US often misunderstand what sorts of speech can be “free”. There’s plenty of restricted speech in the US - hate speech can intensify the sentencing on crimes, libel and slander are both punishable civilly, speech that directs or is likely to incite “imminent lawless action” (e.g. yelling fire in a crowded theater - that is actually the legal reason for why you can’t do that if there isn’t a fire).
That doesn’t even begin to cover the sorts of speech that are heavily suppressed by the government and media but aren’t legally restricted - like how the media chooses not to cover large popular protests sometimes (famously, the antiwar protests around the invasion of Iraq/Afghanistan), or gives disproportional representation to counter protesters to give the illusion that both sides are equally popular, or how anti-capitalist stances are generally ignored or downplayed. Not illegal, but if you can’t really engage in those sorts of speech publicly, they may as well be.
That’s the one book on basic economics they might actually read though. Fuck thomas sowell