All true, but no one AFAIK was threatening abolitionists who used legal due process to actually pass the 13th amendment on free speech grounds. That activity is not the same as openly telling people to aid and abet breaking the current law, or conscientious objection.
> In the South abolitionism was illegal, and abolitionist publications, like The Liberator, could not be sent to Southern post offices. Amos Dresser, a white alumnus of Lane Theological Seminary, was publicly whipped in Nashville, Tennessee for possessing abolitionist publications.[57][58]
The southern states attempted to secede from the country, and fought a civil war that killed almost a million people to prevent the 13th amendment from passing.
