9 out of 12 newspapers in the city of Baltimore, for example, had their presses seized and editors imprisoned at least once during the war.
Prominent persons who were imprisoned, detained, arrested, or otherwise abused by Lincoln's henchmen include:
Henry May, US Rep from Maryland
George Brown, Mayor of Baltimore
William Merrick, U.S. Circuit Judge for the District of Columbia
William Gwin, former U.S. Senator from California
Clement Vallandigham, US Rep from Ohio and leader of the northern Democrat opposition
J. Proctor Knott, Attorney General of Missouri
Lincoln also imprisoned about 20 members of the Maryland legislature, shut down hundreds of opposition newspapers throughout the north, chased the Missouri state government out of town with his army (Knott was a staunch unionist and remained behind believing he would be unharmed, but they threw him into prison anyway and appointed a new AG), and even plotted the arrest of Chief Justice Roger Taney. The message of the Lincoln administration to any potential opponent of his policies was clear: get in my way and I'll have you arrested or worse.
Ofcourse, in the libertarian south, no one was being arrested, no presses were being stopped, no ones rights were being abused.