Possible Sources for Research Question

Research Question: did slavery still exist from the Civil War to World War II after the passing of the Emancipation Proclamation?

Sources:
1. Blackmon, D. A. Slavery By Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II . (2006).
I found this amazing book consisting of narratives of slavery that persisted after the Emancipation. I was looking for a article written about post slavery and this book had amazing reviews about the life of Black Americans after the emancipation.
2. Wong, D. Emancipation an end--as well as a Beginning. 2011. 1-2.
I was trying to figure out whether blacks were aware of the fact that slavery persisted after the Emancipation, and I found this article in the Black Americans perspective.

Summary: in 1863 Lincoln issued the Emancipation Proclamation declaring that "all persons held as slaves shall be free." Making slavery now against the law. But many will argue that ever after the Emancipation slavery still existed under the radar in order to sustain the booming economy. In the book Slavery by Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II Blackmon emphasizes that if you were to ask Black Americans today when slavery ended they would state it ended when Lincoln declared the Emancipation. Many do not know that after the freeing of slaves. many free black Americans were dragged right back into slavery and sometimes the conditions were worst. Danielle Wong in her article " Emancipation end-- as well as a Beginning" goes to emphasize how the court system was manipulated in order to charge a Black American with false charges in order to get him to work for in the mines and in the fields. Did Slavery really persist past the Emancipation?

Questions:
1. Did the government in Southern States know about the reestablishment of Slavery and Remain Oblivious.
2. What are some ways in which slaves were forced back into Slavery with no way out?