Answer:
A poll tax could prevent someone from voting if they are too poor to be able to afford to pay the tax. A literacy test could be used if the person didn't have a formal education that taught them how to read.
In ancient India, the Untouchables were the people who happened to fall outside the formal Caste System. Usually, but not always, this pertained to low-level people in society.
I doubt destroying machines is a good solution to the problem.
