HN has a large libertarian base who are against regulated unions. They are seen as bad government interference in the free enterprise system. I don't want to start an argument but there's a lot of economics science that supports that belief.
If I refuse to propagate speech I disagree with, it might be hypocritical of me, or just impolite, but it's not censorship.
Left libertarianism typically means free market economics + democratically organized and owned workplaces + social libertarianism (free love, free religion, free drugs etc). Right libertarianism is similar, but emphasizes contractualism instead of democratic control.
Left libertarians typically scoff for example at corporations for their limitations on the personal freedoms of the workers, viewing it as a form of slavery.
https://en.wikipedia.org/wiki/Libertarianism
"Libertarianism originated as a form of left-wing politics such as anti-authoritarian and anti-state socialists like anarchists,[6] especially social anarchists,[7] but more generally libertarian communists/Marxists and libertarian socialists"