During Jim Crow their were many unspoken laws that blacks were expected to follow no matter how unnecessary. For example, blacks and whites were not supposed to ride in cars together. If they did African Americans would have to ride in the back seat of cars, while the whites were supposed to sit in the front.
Also on top of being treated all around horrible. They also were striped of their new rights to vote as people would threaten to harm or kill African Americans who tried to vote. Also if they did vote or if a black man won they would rig the vote to make sure who ever they wanted won the election.