Literacy Tests were required in order to register, and the tests were made to prevent Blacks from passing. Grandfather Clauses were passed which prevented anyone from registering to vote unless their grandfathers had been eligible to vote. Descendants of slaves were thus denied the right to vote. Many states enacted poll taxes. Anyone who could not afford the tax (usually poor whites and Blacks) were denied the right to vote. With the threat of violence to the Black voter, or his family, and the fear of loosing a job, or the cost of paying the taxes, many Blacks simply gave up trying to vote and concentrated on trying to keep a job that would enable a family to survive the economic conditions in the south.