June 19, 1865, enslaved people in Texas were notified by Union Civil War soldiers about the abolition of slavery. This was 2.5 years after the final Emancipation Proclamation which freed all enslaved Black Americans.
But Slavery continued.
In 1866, a year after the amendment was ratified, Alabama, Texas, Louisiana, Arkansas, Georgia, Mississippi, Florida, Tennessee, and South Carolina began to lease out convicts for labor. This made the business of arresting black people very lucrative, thus hundreds of white men were hired by these states as police officers.
Their primary responsibility being to search out and arrest black peoples who were in violation of ‘Black Codes’. Basically, black codes were a series of laws criminalizing legal activity for black people. Through the enforcement of these laws, they could be imprisoned.
Once arrested, these men, women and children would be leased to plantations or they would be leased to work at coal mines, or railroad companies. The owners of these businesses would pay the state for every prisoner who worked for them; prison labor. It’s believed that after the passing of the 13th Amendment, more than 800,000 Black people were part of that system of re-enslavement through the prison system.
The majority of White Southern farmers and business owners hated the 13th Amendment because it took away slave labor. As a way to appease them, the federal government turned a blind eye when southern states used this clause in the 13th Amendment to establish the Black Codes.
In South Carolina, if the parent of a Black child was considered vagrant, the judicial system allowed the police and/or other government agencies to “apprentice” the child to an "employer".