More than 150 years after slaves were freed in the U.S., voters in five states will soon decide whether to close loopholes that led to the proliferation of a different form of slavery — forced labor by people convicted of certain crimes.

None of the proposals would force immediate changes inside the states’ prisons, though they could lead to legal challenges related to how they use prison labor, a lasting imprint of slavery’s legacy on the entire United States.

The effort is part of a national push to amend the 13th Amendment to the U.S. Constitution that banned enslavement or involuntary servitude except as a form of criminal punishment. That exception has long permitted the exploitation of labor by convicted felons.

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“The idea that you could ever finish the sentence ‘slavery’s okay when … ’ has to rip out your soul, and I think it’s what makes this a fight that ignores political lines and brings us together, because it feels so clear,” said Bianca Tylek, executive director of Worth Rises, a criminal justice advocacy group pushing to remove the amendment’s convict labor clause.

Read more: AP