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The tag free-speech has no usage guidance and is used on just 7 questions.
It appears to be at best a subset of questions about freedom-of-speech, with 80 questions and some guidance.
free-speech should be synonymised to freedom-of-speech.
Agree that free-speech should be a synonym. The usual guidance is that synonyms eventually be merged. In this case, "free speech" is a popular lay term, so I suspect we might want to maintain the synonym for quite a while.