The politicians in the North that advocated anti-slavery were called Abolitionists.
white abolitionists generally favored the formation of separate black antislavery organizations
Because abolitionists are fighting for abolitionism which is the movement to end slavery. Reformers such as Dorothea Dix were fighting for the insane who were being mistreated. So in a way abolitionists are reformers but they are fighting to end slavery.
Beecher's Bibles
The group of US citizens named the antislavery abolitionists wanted to end slavery in the United States. This group of great influence believed that slavery was wrong and contradicted the Declaration of Independence.
Well, the abolitionists started Antislavery organizations and societies. They also went about speaking against slavery. Some abolitionists, like John Brown took it to the extremes by raiding and attacking families that had slaves.
Abolitionists cited biblical verses in their sermons and speeches to lure the public to oppose and help end the institution of slavery. In some cases, abolitionists asked former slaves such as Frederick Douglas to speak publicly about their experience.
Carminella Biondi has written: 'Ces esclaves sont des hommes' -- subject(s): Antislavery movements, Abolitionists
Merton Lynn Dillon has written: 'Slavery attacked' -- subject(s): Antislavery movements, History, Slavery 'Elijah P. Lovejoy, abolitionist editor' -- subject(s): Abolitionists, Antislavery movements, Biography
Abolitionists
David Turley has written: 'Yellowstone' 'The culture of English antislavery, 1780-1860' -- subject(s): Abolitionists, Antislavery movements, History, Slavery and the church, Social reformers 'Slavery' -- subject(s): Cross-cultural studies, History, Slavery
John Brown was considered an abolitionist hero of the first magnitude and a treasonous rebel by the federal govt.