The Collaborative International Dictionary
Disunionist \Dis*un"ion*ist\, n. An advocate of disunion, specifically, of disunion of the United States.
Wiktionary
n. A supporter of disunionism.
Usage examples of "disunionist".
Secret Service reports that several hundred Maryland disunionists have returned to their homes from visits to rebel headquarters in Virginia, and may interfere with the rights of suffrage of loyal citizens.
The members who composed it were, seven-eighths of them, office-holders, office-seekers, pimps, malignants, conspirators, murderers, fancy-men, custom-house clerks, contractors, kept-editors, spaniels well-train’d to carry and fetch, jobbers, infidels, disunionists, terrorists, mail-riflers, slave-catchers, pushers of slavery, creatures of the President, creatures of would-be Presidents, spies, blowers, electioneerers, bawlers, bribers, compromisers, lobbyers, sponges, ruined sports, expell’d gamblers, policy-backers, monte-dealers, duelists, carriers of conceal’d weapons, deaf’ men, pimpled men, scarr’d inside with vile disease, gaudy outside with gold chains made from the people’s money and harlot’s money twisted together.