Voters in three states approved ballot measures that will change their state constitutions to prohibit slavery and involuntary servitude as punishment for crime, while those in a fourth state rejected the move. The measures approved Tuesday curtail the use of prison labor in Alabama, Tennessee and Vermont. In Louisiana, a former slave-holding state, voters rejected a ballot question known as Amendment 7 that asked whether they supported a constitutional amendment to prohibit the use of involuntary servitude in the criminal justice system. After Tuesday’s vote, more than a dozen states still have constitutions that include language permitting slavery and involuntary servitude for prisoners. Several other states have no constitutional language for or against the use of forced prison labor.

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