What kind of libertarianism? Afaik left-libertarianism is in favour of unions. If it's right-libertarianism you're referencing then can you share some of the "economics science" that promotes it?
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"