A grandfather clause is aGroup of answer choicesform of disenfranchisement in which potential voters must demonstrate the ability to read as a condition for registering to vote.policy designed to disenfranchise Blacks by exempting Whites who had been able to vote at the end of the Civil War, but not Blacks, from various voting restrictions.fee charged as a condition of registering to vote, which disenfranchises the impoverished, especially African Americans.measure to increase voting rights for racial and ethnic minority groups.