1) Felony disenfranchisement laws. These laws bar people convicted of certain felonies from voting. The specifics vary from state to state, but some felonies that commonly result in disenfranchisement include murder, rape, and armed robbery.
2) Voter ID laws. These laws require voters to present a government-issued photo ID in order to cast a ballot. Proponents of these laws say they are necessary to prevent voter fraud, but critics argue that they disproportionately impact minority and low-income voters.
3) Proof of citizenship laws. These laws require voters to provide proof of citizenship in order to register to vote. Proponents of these laws say they are necessary to prevent non-citizens from voting, but critics argue that they are unnecessary and discriminatory.
4) Residency requirements. These laws require voters to have lived in a particular state or district for a certain period of time in order to register to vote. Proponents of these laws say they are necessary to prevent people from "vote hopping," which is the practice of registering to vote in multiple jurisdictions.