The reason why states bar those convicted from serious crimes from voting is due to the laws that were established during the reconstruction era.
During the reconstruction era, the felony disenfranchisement was established. It was one of the laws such as the poll tax that was established in order to reduce the involvement of black voters.
Today the states bar those that are convicted from voting till they are reinstated to vote. In some states the policy may be different.
When the convicted person's right is reinstated, they may not get the automatic voter registration.
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