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You still have to get from "unions are bad" to "union discussion should be censored".

Censored is not technically the right word, though. You don't directly get thrown in jail for discussing union stuff.

censorship ≠ incarceration

Well, almost. Censorship is generally backed by some sort of threat of violence.

If I refuse to propagate speech I disagree with, it might be hypocritical of me, or just impolite, but it's not censorship.